A vital part of heath care for your pet, vaccines will help keep their immune systems strong. Just like children, puppies and kittens will eventually lose the antibodies they recieved from their mother. Puppies and kittens need to be immunized every 3 weeks starting at 6 weeks until they are around 14 - 16 weeks old to help them produce their own antibodies. Some vaccines, such as Rabies, are required by law or required for boarding/grooming.