Vaccination of companion animals protects individual animals from preventable disease and contributes to community-level disease control that benefits unvaccinated and vulnerable animals.
Companion animal vaccination welfare operates at individual and community levels. An individual vaccinated dog or cat is protected from diseases that cause severe suffering — parvovirosis in dogs causes haemorrhagic gastroenteritis with extreme suffering over several days; feline panleukopenia is rapidly fatal. The welfare benefit of vaccination for the individual animal is therefore direct and significant. At the population level, sufficient vaccination coverage reduces disease circulation benefiting vulnerable unvaccinated animals including puppies before their vaccine series is complete and immunocompromised individuals. Declining vaccination rates driven by misinformation create welfare risks for entire communities. The ethical case for routine vaccination of companion animals is clear — the welfare benefit vastly outweighs the small risk of adverse reactions.