Dogs and cats in Texas must be vaccinated by a veterinarian by the time the animal is four months of age, then given a booster 12 months after the initial vaccination. Thereafter, the animal must be vaccinated at intervals of no longer than 36 months if a 3-year vaccine is used. However, your veterinarian may prefer to use a 1-year vaccine. He/she can explain the pros and cons to you pertaining to which vaccine to use with your pet. Although not required by state law, there are many other diseases for which your pet should be immunized annually. To safeguard your pet's and your family's health, you should visit Shaffer Veterinary Services at least once a year.