It is time to take my 13 month old indoor cat to the vet for her rabies shot. My dad's friend's wife is a vet, and she said the cats only need a rabies shot every 3 years, but our vet only offers the yearly shot. Is there really a difference between the two shots, or is the one year shot just a scam? If there is a difference, is the three year shot harder on their bodies? We might consider switching vets if the three year shot is better for our pets. Thanks!