What can be a potential reaction to a vaccination in cats?

When it comes to potential reactions to vaccinations in cats, the development of a sarcoma is significant and is a recognized adverse effect, particularly associated with some feline vaccines. Sarcomas are malignant tumors that can occur at the injection site in cats. They are particularly linked with certain vaccines, such as those for rabies and feline leukemia virus, leading to a condition known as injection site sarcoma (ISS). This reaction is critically important for veterinary professionals to monitor as early detection can significantly affect treatment outcomes.

In contrast, while cats may experience minor side effects like fever or lethargy after vaccination, these reactions are generally less severe and transient. Increased appetite and hair loss are not typical reactions associated with vaccinations and would not be expected or documented in the same manner as a sarcoma. Understanding the potential for serious side effects like sarcoma aids veterinarians and pet owners in making informed decisions regarding vaccinations and monitoring follow-up care.