CAT HEALTH · VACCINE GUIDE · REVIEWED AUGUST 16, 2026
Core protection, feline leukemia virus risk, indoor-cat considerations, injection-site monitoring, and the questions that shape an individual plan.
FELINE VACCINATION
Feline vaccination balances the seriousness of disease with each cat’s age, health, household, escape potential, contact with other cats, travel, and local law. The goal is appropriate protection—not simply the greatest possible number of injections.
This combination is commonly abbreviated FVRCP: feline viral rhinotracheitis (caused by feline herpesvirus), calicivirus, and panleukopenia. Panleukopenia can be rapidly fatal, while herpesvirus and calicivirus are major causes of contagious respiratory and oral disease. The vaccine does not prevent every cause of sneezing.
Rabies is fatal and zoonotic. Indoor status does not eliminate the possibility of an escaped cat or a bat entering a home. Timing must follow local law and product labeling.
FeLV spreads mainly through close cat contact. Guidelines treat FeLV vaccination as core for kittens and young cats because lifestyles can change; ongoing adult vaccination depends on exposure risk.
Most post-vaccine soreness or a small lump is temporary. Cats also have a rare risk of injection-site sarcoma, which is why veterinary teams document sites and choose products thoughtfully.
Contact your veterinarian if a lump remains for 3 months, is larger than 2 centimeters, or is still increasing in size 1 month after the injection. Do not wait for all three criteria.
Save the vaccine name, date, location, and next-due date. Tell the clinic about any prior reaction or persistent injection-site lump before future vaccination.
TRUSTED SOURCES
Source links are provided so readers can review the underlying guidance. Publication dates and recommendations can change; confirm individual plans with the treating veterinary team.