Cat FIV: Managing Feline Immunodeficiency Virus for Good Welfare

Feline immunodeficiency virus affects many cats, but with appropriate care FIV-positive cats can live long, high-quality lives. Welfare-centred management is achievable.

Key Facts

FIV is a lentivirus affecting domestic cats, analogous to HIV in humans; it is not transmissible to humans.
Transmission occurs primarily through bite wounds; intact male cats with outdoor access are most at risk.
FIV is estimated to affect 1-4% of cats in the UK and similar proportions worldwide.
Most FIV-positive cats live for years without clinical signs; the virus suppresses immune function gradually.
Clinical disease typically manifests as repeated infections, chronic gingivitis, weight loss, and opportunistic disease.
FIV-positive cats can live normal lifespans in indoor environments where infection risk is minimised.
There is no cure, but supportive care, regular veterinary monitoring, and preventing secondary infections are highly effective.
FIV-positive cats are frequently euthanised unnecessarily upon diagnosis; stigma around the diagnosis persists in some veterinary and shelter contexts.

Welfare Considerations

FIV-positive cats face a significant welfare risk from inappropriate management following diagnosis. Many are euthanised upon positive testing despite having many years of good-quality life ahead of them. The welfare case for keeping FIV-positive cats is strong: with indoor lifestyle, regular monitoring, prompt treatment of secondary infections, and appropriate nutrition, the majority live healthy, comfortable lives. The persistent stigma around FIV — sometimes manifested as reluctance to adopt FIV-positive shelter cats — reflects outdated information. Modern evidence clearly supports the position that FIV-positive cats can be excellent companions with good welfare, provided they receive appropriate care and are not placed in situations where they could transmit the virus to other cats.

What You Can Do

Consider adopting an FIV-positive cat — with appropriate indoor management, they make wonderful companions.
Do not accept euthanasia as the only option for an FIV-positive cat without exploring management options.
Keep FIV-positive cats indoors to prevent both virus transmission and secondary infections.
Ensure regular veterinary monitoring (every 6 months) for FIV-positive cats.
Advocate for shelters to adopt progressive policies that facilitate adoption of FIV-positive cats.
Support education programmes that correct misconceptions about FIV in veterinary and public contexts.