Adopting a FIV or FeLV positive cat: what to genuinely expect

The first step is to stop treating the two acronyms as synonyms. FIV, feline immunodeficiency virus, is a slow progressing virus that gradually weakens the immune defences, a little like its human counterpart but with no possibility of passing to people. FeLV, feline leukaemia virus, is more insidious: it can cause anaemia, immune suppression and tumours, and in cats that stay truly infected it tends to weigh more heavily on life expectancy. Knowing which virus you are dealing with changes the choices about cohabitation and monitoring.

The question that stalls most adoptions is about the cats already in the house. The answer depends on the virus and on the animals' temperament. A calm, well settled FIV positive cat can live with negative cats without infecting them, because transmission needs deep bites of the kind that happen in real fights, not in play or normal contact. FeLV is more delicate, because it passes through close, prolonged contact, so cohabitation with negative cats has to be assessed case by case, and it is often preferred to keep them apart or to adopt already positive cats in pairs.

• Life strictly indoors or in secure fenced spaces: it protects the positive cat from infections and negative cats from contagion.
• No fighting: cats that tolerate each other and have enough resources, bowls, litter trays and hiding spots, quarrel far less.
• Neutering of all cats: it reduces territorial aggression and therefore bites, the main vehicle for FIV.
• Consistent pairs: two cats both positive live together with no added mutual risk and keep each other company.
• Separate bowls and litter trays when living with negative cats and FeLV is involved, to limit saliva sharing.
• Gradual introduction as with any new cat, because stress lowers the defences and encourages opportunistic illness.

If there are no other cats in the house, most of these concerns disappear. A positive cat as the only animal simply lives like any indoor cat, with the sole difference of slightly closer monitoring.

The first days are for helping the cat settle and building the clinical baseline the following years will rest on. You do not need to do everything at once, but it pays to start tidily.

1. 1

   Set up a quiet room

   Prepare a dedicated space with a litter tray, water, food and a hiding spot. A calm, low stress cat keeps its immune defences more efficient, which counts double when there is a virus in the background.

2. 2

   Gather the medical paperwork

   Ask for the test result, the date, the type of virus and any treatment already given. Keep it all in one place, so every vet who sees the cat starts from the same picture.

3. 3

   Book the baseline consultation

   Agree an initial visit with your vet to establish the starting point: weight, condition of the gums, mouth and lymph nodes. It is the snapshot you will compare future check-ups against.

4. 4

   Set the monitoring schedule

   With your vet decide how often to review the cat, usually once or twice a year while it is well. Set the reminders straight away, while the topic is fresh.

5. 5

   Secure the living arrangements

   If you have other cats, decide the separation or cohabitation strategy from the start, according to the virus, without putting it off. The habits set in the first week are the ones that stick.

6. 6

   Observe and record what is normal

   In the early days note appetite, litter tray use and activity level. Knowing what the cat is like when it is well makes it far easier to notice early when something changes.

Long term management of a positive cat is not complicated: it is steady attention plus quick action when needed. The aim is to catch opportunistic illness early, meaning those common problems that in a positive cat can worsen faster.

• Regular veterinary check-ups, typically every six to twelve months, with an examination of the mouth and gums and, when indicated, blood work.
• Attention to the mouth: gingivitis and stomatitis are common and should be treated early, because pain reduces eating.
• A complete, good quality diet, avoiding raw food that can introduce other infectious agents into a less ready immune system.
• Regular parasite control and a clean environment, so as not to add parasites to an already burdened body.
• No delay in the face of symptoms: fever, loss of appetite, weight loss, pale gums and recurrent infections deserve prompt assessment.
• Weight tracked over time: a slow, steady drop is often the first sign that something is shifting.

Much of the fear around these cats comes from outdated beliefs. It is worth tackling them one by one, because they are often the only obstacle between a cat and a good home.

• It is not true that they live only briefly: many FIV positive cats have a life expectancy close to that of negative cats, and plenty of FeLV positive cats live a long time too.
• It is not true that they must be totally isolated: cohabitation is managed, not forbidden, and in most cases it is possible.
• It is not true that they infect people or the family dog: both viruses affect cats only.
• It is not true that they suffer constantly: a positive cat that is well has no pain or malaise from the virus at that moment.
• It is not true that they need costly, continuous treatment: the main expense is regular check-ups, not permanent therapy.
• It is not true that they are second rate adoptions: they are often adult, sociable, grateful cats who have waited a long time only because an acronym frightens whoever reads the listing.

A positive test describes a risk, not a prognosis. The cat in front of you is still the same cat once you have read the record.