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Updated on September 23rd, 2025
Pet's info: Cat | American Shorthair | Male | neutered | 2 years and 9 months old
Why are medicines given to dogs by weight but vaccines are one size for all?
2 Answers

Answered By Jennifer Summerfield, DVM CPDT-KA
Veterinarian, Certified Dog Trainer
Published on May 22nd, 2017
Answered By Jennifer Summerfield, DVM CPDT-KA
Veterinarian, Certified Dog Trainer
Published on September 27th, 2017
Hi there! This is because the vaccine dose is based on the amount of antigen needed to stimulate an immune response, which has nothing to do with the size of the animal. Vaccines are very different from drugs, in this respect! :)
1Pet Parents found this answer helpful