Beyond the Diagnosis: Supporting Your Cat’s Behaviour During and After Veterinary / FIP Treatment

A feline behaviourist’s guide to medication stress, trauma, neurological changes and rebuilding confidence

A diagnosis of feline infectious peritonitis can turn everyday life upside down almost overnight.

Suddenly, a cat who was once simply a much-loved companion becomes a patient. Days begin to revolve around medication, veterinary appointments, blood tests, weighing, appetite monitoring and watching closely for every small change.

For many cats, treatment is lifesaving. However, the emotional and behavioural effects of serious illness and prolonged care are often overlooked.

Some cats begin hiding when medication time approaches. Others become fearful of being picked up, avoid the person administering their treatment, resist handling or refuse foods previously used to disguise tablets. Some become unusually clingy and struggle when left alone.

Cats affected by neurological FIP may face additional challenges involving balance, coordination, awareness, mobility and confidence. These changes cannot simply be corrected through conventional training.

These cats are not being difficult, ungrateful or naughty.

They are responding to illness, discomfort, reduced control and repeated experiences they may have found frightening or unpleasant.

Supporting a cat through FIP therefore involves more than administering medication correctly. It also means reducing avoidable stress, protecting the relationship between cat and caregiver and helping the cat feel safe throughout treatment and recovery.

This article has been developed for FIP Cats Australia as part of its commitment to supporting cats and their families through diagnosis, treatment and recovery. FIP Cats Australia provides information, practical resources and community support for Australian families navigating FIP.

Through its partnership with The Smart Cat Society, families can also access feline-specific behavioural support when illness, prolonged medication, neurological changes or repeated handling begin affecting a cat’s confidence, behaviour or relationship with its caregivers.

Treatment addresses the disease. Behavioural support helps the cat and family cope with the experience surrounding it.

Serious Illness Changes How a Cat Experiences the World

Cats rely heavily on familiarity and predictability.

They feel safest when they can anticipate where they will eat, sleep and toilet, as well as when and how people are likely to interact with them. FIP can disrupt almost every part of that predictable world.

A cat undergoing treatment may experience pain, nausea, fever, weakness, reduced appetite, repeated restraint, unfamiliar medication tastes, veterinary travel, blood collection and changes to its normal household routine.

The cat may also be separated from other animals, moved into a recovery room or monitored more frequently by worried owners.

Behaviour during treatment may therefore be influenced by several overlapping factors. A cat may be physically unwell, frightened, frustrated by reduced mobility, affected by medication or exhausted by repeated procedures.

Before describing any change as a behavioural problem, it is important to ask:

Could illness, pain, medication or neurological impairment be contributing to this behaviour?

Sudden or worsening behavioural changes should always be discussed with the veterinarian overseeing the cat’s FIP treatment.

Can FIP Treatment Be Traumatic?

The word trauma should not be used casually, but repeated frightening or unavoidable experiences can create lasting negative associations.

A cat does not understand that a capsule, injection or blood test may be helping to save its life. The cat understands only what it can see, smell and feel in that moment.

Over time, it may learn that:

• A particular room predicts medication.
• A towel predicts restraint.
• Its owner walking towards it predicts being picked up.
• A certain treat contains an unpleasant tablet.
• The carrier predicts veterinary procedures.
• A particular time of day predicts an unwanted interaction.

This is associative learning.

The cat is not holding a grudge or deliberately making treatment difficult. It has learned that certain signals predict discomfort or loss of control and is attempting to avoid them.

This may appear as hiding, running away, freezing, crouching, growling, swatting, biting, refusing food or remaining tense after treatment has finished.

Some cats may also urinate or defecate during restraint when extremely frightened.

Repeatedly overriding these signs without adjusting the process can intensify fear and defensive behaviour. The aim should be to make necessary treatment as calm, predictable and efficient as possible.

Your Cat Is Not Giving You a Hard Time

FIP treatment can be exhausting and emotionally overwhelming.

When an owner is already frightened about losing their cat, medication resistance may feel personal. It is important to remember that the cat is not giving its caregiver a hard time.

The cat is having a hard time.

Growling, hissing, scratching and biting are usually attempts to create distance from something the cat perceives as threatening. These behaviours are communication, not defiance.

Punishing warning signals may make the cat more frightened and can suppress communication without addressing the underlying fear. A cat that learns growling is ineffective may progress to biting more quickly.

Remain calm, avoid confrontation and review the treatment process whenever fear or defensive behaviour is escalating.

Never change the prescribed dose, stop medication or alter the formulation without consulting the treating veterinarian.

Making Medication Less Stressful

Some discomfort may be unavoidable, but many aspects of medication administration can be improved.

Prepare everything before approaching the cat

Have the medication, towel, treats and any other equipment ready.

A prolonged struggle while searching for supplies increases arousal and gives the cat more opportunities to escape. Once the procedure begins, it should be calm, organised and brief.

Use a quiet, secure location

Choose a room with good lighting, secure footing and minimal noise.

Avoid chasing the cat through the house. Chasing may turn medication into a frightening event and teach the cat to flee whenever approached.

Where possible, calmly guide the cat into the treatment area before bringing out the medication.

Keep the sequence predictable

Predictability can reduce uncertainty.

Using the same calm sequence may be less stressful than surprising the cat in different rooms and at different times each day.

However, avoid turning the cat’s favourite bed or main hiding place into a treatment area. Every cat needs somewhere that continues to feel safe.

Protect favourite foods

Hiding medicine in food may work for some cats, but it can also create food aversion if the cat detects a bitter or unfamiliar taste.

This is particularly concerning during FIP treatment, when maintaining adequate food intake may already be difficult.

Use only a small portion of food for medication and offer the normal meal separately. Do not repeatedly contaminate the cat’s main diet with medication.

Always ask the veterinarian or pharmacist whether a medication can safely be crushed, opened, divided or mixed with food before doing so.

Follow treatment with something positive

After medication, offer something the cat genuinely values.

This may be:

• A preferred treat
• A lickable food
• A short play session
• Gentle brushing, when enjoyed
• Access to a favourite resting area
• Quiet time without further handling

A reward does not erase an unpleasant procedure, but it can create a predictable ending and help the cat recover emotionally afterwards.

Allow the cat to leave

Once treatment is complete, allow the cat to move away.

Do not immediately follow, pick the cat up again or insist on affection. Provide a quiet place where it can settle without being touched or watched.

Control over distance is an important part of emotional recovery.

Cooperative Care During Treatment

FIP medication must be administered as prescribed, so complete choice may not always be possible. However, elements of cooperative care can still be introduced.

The aim is to reduce force wherever it can safely be reduced and give the cat small opportunities for control.

Outside medication time, the cat can be taught to:

• Step onto a mat
• Enter a carrier voluntarily
• Stand on weighing scales
• Follow a target
• Accept brief handling
• Remain on a secure, non-slip surface
• Tolerate gentle touching around the head or mouth

These exercises should be taught using positive reinforcement and kept very brief.

One or two successful repetitions may be enough. Training should stop before the cat becomes tired, frustrated or fearful.

Cooperative care does not mean allowing a cat to refuse lifesaving treatment. It means making necessary treatment more predictable and less confrontational.

When Your Cat Starts Avoiding You

One of the most upsetting changes for owners is when a previously affectionate cat begins running from the person giving the medication.

This does not mean the relationship has been permanently damaged.

The owner has temporarily become part of the medication prediction.

To rebuild trust, create frequent interactions in which nothing medical happens.

Several times each day:

1. Enter the room without approaching the cat.
2. Place or gently toss a treat nearby.
3. Sit quietly for a short period.
4. Leave without touching or restraining the cat.

Gentle play and simple target training can also help when the cat feels well enough.

The important point is that not every approach should lead to medication, restraint or examination.

The cat needs repeated evidence that its caregiver still predicts companionship, safety and enjoyable experiences.

Where more than one competent adult is available, treatment responsibilities may sometimes be shared. However, consistency and calm handling are more important than repeatedly changing the person administering care.

Hiding and Withdrawal

Sick cats commonly seek quiet, enclosed areas.

Hiding is not automatically a problem. It can be a useful coping strategy that helps a cat feel protected.

The aim is not to eliminate hiding but to provide safe places that are:

• Warm and comfortable
• Easy for the cat to access
• Close to food, water and litter
• Suitable for monitoring
• Accessible enough that treatment does not become a daily chase

A covered bed, open carrier or cardboard box in a quiet room may provide security while still allowing the caregiver to observe the cat.

Avoid dragging the cat out of hiding unless urgent care requires it. Repeatedly invading every refuge may leave the cat feeling that nowhere in the home is safe.

Defensive Aggression During Medication

Defensive aggression often occurs when the cat feels trapped, painful, frightened or unable to escape.

Early warning signs may include:

• Flattened or rotated ears
• Dilated pupils
• Tail lashing
• Crouching
• Skin twitching
• Turning sharply towards the handler
• Raising a paw
• Growling or hissing

When it is safe to do so, pause before the cat reaches the point of biting or scratching.

Review whether:

• The restraint is excessive.
• The cat may be painful or nauseated.
• The surface is slippery.
• The medicine is bitter or irritating.
• The procedure is taking too long.
• A different formulation may be available.
• Veterinary pain, nausea or anxiety support is needed.

Never use dominance-based handling or attempt to “show the cat who is boss.” This increases fear and creates a greater risk of injury to both cat and caregiver.

Food Aversion and Reduced Appetite

Reduced appetite during FIP may be related to illness, fever, nausea, pain, stress, medication or negative associations created during dosing. Appetite loss and weight loss are recognised clinical concerns in cats with FIP.

Contact the treating veterinarian promptly when a cat stops eating or begins eating substantially less.

Helpful environmental changes may include:

• Offering small meals more frequently
• Feeding in a quiet location
• Using wide, shallow bowls
• Keeping food away from litter trays and treatment areas
• Warming food slightly to increase its aroma
• Providing more than one feeding location
• Separating the recovering cat from competitive animals
• Avoiding repeated pressure to eat
• Protecting favourite foods from medication contamination

Do not assume a cat refusing food is being stubborn.

During FIP treatment, reduced food intake should be treated as a medical concern first.

Litter-Tray Problems During Illness

A cat urinating or defecating outside the litter tray may be physically unable to reach or enter it comfortably.

Possible causes include weakness, urgency, pain, confusion, neurological impairment, reduced balance or a negative association with the tray’s location.

Support the cat by providing:

• Low-entry litter trays
• A tray close to the recovery area
• Trays on every level of the home
• Unscented litter
• Secure, non-slip footing
• Additional trays in multi-cat homes
• Puppy pads around the tray when accidents are likely
• Frequent cleaning without strong fragrances

Do not punish accidents.

For a weak or neurologically impaired cat, toileting outside the tray may reflect a physical limitation rather than a loss of training.

Any sudden elimination change should be reported to the veterinarian.

Clinginess and Constant Reassurance-Seeking

Some cats withdraw during treatment. Others become intensely attached to their caregiver.

A recovering cat may follow its owner, cry when left alone, sleep pressed against them or repeatedly seek physical contact.

This may occur because the caregiver has become a strong source of warmth, food, protection and reassurance.

There is no need to ignore or reject a frightened cat. Comfort can be offered while also supporting gradual independence as the cat becomes stronger.

Provide:

• Warm, secure resting areas
• Window views
• Safe independent toys
• Familiar bedding and scents
• Predictable periods of attention
• Simple enrichment suited to the cat’s physical ability
• Brief absences followed by calm returns

The aim is to help the cat feel safe in more than one place and during more than one type of activity.

Neurological FIP and Behaviour

Neurological FIP can affect the brain, spinal cord and surrounding tissues. Possible signs include altered coordination, weakness, tremors, seizures, nystagmus, head tilt, paralysis and behavioural or awareness changes.

Owners may notice:

• Wobbliness or falling
• Difficulty jumping
• Reduced awareness of obstacles
• Confusion or altered responses
• Sudden vocalisation
• Changes in sleep or interaction
• Reduced ability to groom or toilet
• Increased fear when moving
• Startling when approached
• Frustration caused by reduced mobility

These signs require veterinary management. They should not be interpreted as disobedience and cannot simply be corrected through training.

Neurological recovery may also be uneven. Mild but stable signs may sometimes persist while the cat is otherwise responding, but new or worsening signs require prompt veterinary reassessment.

Supporting a Neurologically Affected Cat at Home

Reduce the risk of falling

Block access to high shelves, staircases and unstable furniture.

Place cushions or non-slip mats beside low furniture where the cat may attempt to jump.

Keep resources close together

Food, water, bedding and litter trays should be available within a small, easily navigated area.

The cat should not need to cross slippery floors or negotiate stairs to meet basic needs.

Improve traction

Use runners, yoga mats or non-slip rugs.

Cats with reduced coordination may become reluctant to move if their feet repeatedly slide.

Use low and stable furniture

Provide broad steps, ramps and low platforms rather than narrow climbing structures.

All equipment should remain steady when the cat steps onto it.

Avoid rearranging the home

Cats experiencing visual, balance or spatial-processing difficulties may rely heavily on memory.

Keep furniture, bowls and litter trays in consistent locations.

Approach carefully

A cat with altered vision or awareness may startle when touched unexpectedly.

Speak before approaching, allow the cat to smell your hand and avoid reaching suddenly from above.

Adapt play

Use slow, predictable toys kept close to the floor.

The aim is not vigorous exercise. It is comfortable movement, engagement and successful participation.

Record changes

Keep notes on mobility, appetite, toileting, sleep, interaction and neurological signs.

Short videos can also help the veterinary team assess changes that may not be obvious during an appointment.

Tension Between Household Cats

Hospitalisation, medication smells and changes in movement can affect how other cats respond to the recovering cat.

A housemate may hiss, avoid or confront the returning cat. This does not necessarily mean the relationship has permanently broken down.

Cats use scent, movement and familiarity when recognising one another. A cat returning from treatment may temporarily smell or behave differently.

During recovery:

• Give the unwell cat a separate quiet area.
• Duplicate food, water, litter and resting resources.
• Exchange bedding to maintain familiar scent.
• Allow calm visual contact through a barrier.
• Reward relaxed behaviour.
• Avoid forcing the cats together.
• Conduct a gradual reintroduction when tension persists.

A weak or neurologically impaired cat may be unable to escape conflict normally, making supervision especially important.

Helping Children Interact Appropriately

Children may find it difficult to understand why a sick cat no longer wants to be picked up or cuddled.

Explain that the cat is recovering and needs to choose when interaction occurs.

Helpful family rules include:

• Do not pick the cat up.
• Do not follow it into hiding places.
• Stroke only when the cat approaches.
• Keep voices and movements calm.
• Never disturb the cat while eating, sleeping or toileting.
• Ask an adult before offering food or medicine.

Children can still participate positively by gently tossing treats, preparing simple enrichment or sitting quietly nearby.

The Emotional Toll on Owners

FIP treatment can be traumatic and exhausting for caregivers as well as cats.

Owners may experience fear of relapse, guilt about restraining the cat, sleep deprivation, financial pressure, hypervigilance and anxiety about every small change.

This stress can influence interactions.

A worried owner may repeatedly wake, touch, follow or examine the cat, unintentionally reducing its opportunities to rest.

Monitoring remains important, but normality matters too.

Use a written treatment record for medication, weight, appetite and symptoms instead of relying on constant checking. Share responsibilities where possible and maintain regular communication with the veterinary team.

Caring for a seriously ill cat is demanding. Owners also deserve practical and emotional support.

Rebuilding Confidence After Treatment

When medication ends, behaviour may not immediately return to normal.

The cat may remain wary of certain rooms, foods, towels, carriers or approaches. Some cats need time to learn that these cues no longer predict treatment.

Restore ordinary routines gradually:

• Feed meals at predictable times.
• Reintroduce gentle play.
• Protect uninterrupted sleeping periods.
• Allow voluntary social contact.
• Provide access to favourite areas.
• Use short positive training sessions.
• Avoid unnecessary restraint.

Do not overwhelm the cat with new activities simply because treatment has finished.

Confidence develops through repeated, successful experiences.

Positive Reinforcement as Rehabilitation

Reward-based training can help replace a treatment-centred relationship with a cooperative partnership.

Useful exercises include:

• Touching a target
• Stepping onto a mat
• Entering a carrier
• Standing on scales
• Coming when called
• Accepting brief handling
• Walking onto a low platform

Keep each session brief and finish while the cat remains comfortable.

For cats recovering from neurological impairment, reward effort rather than physical perfection. One balanced step or a small weight shift may represent meaningful progress.

Common Problems and How to Help

“My cat runs away whenever I approach.”

Create many approaches that do not lead to treatment. Walk past, gently toss a treat and continue without touching the cat.

“My cat hides at medication time.”

Prepare medication out of sight, use a calm treatment area and provide a safe place for the cat to decompress afterwards. Avoid chasing it through the home.

“My cat bites during medication.”

Treat biting as possible fear, pain or restraint intolerance. Speak with the veterinarian about technique, formulation and supportive medication. Do not punish the cat.

“My cat refuses food that was used for tablets.”

Stop using that food for medication. Offer it separately only after the negative association has had time to weaken.

“My cat has stopped using the litter tray.”

Arrange veterinary assessment and provide low-entry trays close to the cat’s resting area.

“My cat is clingy and cries when I leave.”

Offer predictable reassurance while gradually supporting independent resting and gentle enrichment.

“My cat seems confused or behaves differently.”

Record the behaviour and contact the veterinarian, particularly when neurological FIP has been diagnosed or suspected.

“My other cat no longer accepts the recovering cat.”

Separate the cats temporarily, exchange familiar scents and conduct a gradual reintroduction.

“My cat still fears me after treatment has ended.”

Rebuild the relationship through quiet proximity, treats, play and voluntary interaction. Avoid unnecessary picking up or restraint while trust is being restored.

When Behaviour Requires Urgent Veterinary Attention

Seek prompt veterinary advice if you observe:

• New or worsening weakness
• Loss of balance
• Tremors or seizures
• Sudden changes in awareness or behaviour
• Collapse
• Difficulty breathing
• Difficulty swallowing
• Sudden vision changes
• Persistent vomiting
• Refusal of food
• Significant weight loss
• Inability to urinate or defecate
• Rapid deterioration after initial improvement

Behavioural change may be the first visible sign of a medical complication.

Behaviour support should complement veterinary treatment, never replace it.

Becoming a Better Cat Parent During FIP

Being a good cat parent does not mean completing every procedure perfectly or preventing every moment of distress.

It means remaining observant, compassionate and willing to adapt.

It means recognising that:

• Fear is not disobedience.
• Aggression is often defensive communication.
• Hiding may be a coping strategy.
• Appetite loss is not stubbornness.
• Neurological impairment is not poor training.
• Recovery does not follow a fixed timeline.
• Trust can be rebuilt.

Most importantly, it means continuing to see the cat behind the diagnosis.

Your cat still needs warmth, rest, choice, gentle companionship, familiar scents and opportunities to engage in normal feline behaviour.

Medication treats the disease.

Safety, predictability and trust help the cat cope with the treatment experience.

Help Is Available

Families navigating FIP should not feel that they must manage every stage alone.

FIP Cats Australia is a registered Australian not-for-profit organisation providing information, resources and support for people caring for cats affected by FIP. Its website includes information about FIP, where to seek help and stories from cats and families who have completed treatment.

FIP Cats Australia is working in partnership with The Smart Cat Society to help families experiencing behavioural difficulties during treatment, observation and recovery.

Behavioural assistance may be beneficial for:

• Fear or avoidance associated with medication
• Hiding when caregivers approach
• Defensive aggression during handling
• Food aversion after medication
• Loss of trust in a caregiver
• Reduced confidence following prolonged illness
• Clinginess and difficulty coping alone
• Litter-tray problems associated with weakness or neurological impairment
• Tension between household cats
• Carrier and veterinary-visit anxiety
• Behavioural changes associated with neurological FIP
• Rebuilding normal routines after treatment

The Smart Cat Society provides feline-specific behavioural guidance using ethical, science-based and positive-reinforcement methods.

This support does not replace veterinary diagnosis, treatment or medication advice. It works alongside the treating veterinarian and the support provided by FIP Cats Australia to reduce stress, improve communication and help the cat regain confidence.

Eligible families caring for cats undergoing FIP treatment or post-treatment recovery can access discounted behavioural consultations through this partnership.

For information, practical resources and FIP support, visit FIP Cats Australia.

For feline behaviour consultations and recovery support, visit The Smart Cat Society.

Supporting the Whole Recovery Journey

Recovery from FIP involves more than completing a course of medication.

Veterinary treatment is essential, but some cats also need support recovering from fear, repeated restraint, disrupted routines, reduced mobility and the loss of control associated with prolonged illness.

Medical and behavioural support should not compete with one another.

They should work together.

Through the partnership between FIP Cats Australia and The Smart Cat Society, families can access support that considers both the disease and the individual cat living through it.

FIP Cats Australia helps families navigate diagnosis and treatment. The Smart Cat Society provides additional support when fear, avoidance, neurological impairment or changes in the relationship between cat and caregiver create behavioural difficulties.

Together, the goal is not only to help cats survive FIP.

It is to help them feel safe again, rebuild confidence and return to a life in which they can genuinely thrive.

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