I used to take them at least once a year for their shots and when necessary if they got sick. But, since they have both had such bad reactions to the annual vaccines, I don't take them in anymore. Halo almost died twice from receiving multiple shots during one visit. Morganna had to have her cancerous leg amputated. The vet thinks the cancer was the result of the rabies vaccine. Soooooo, after long discusions with the vet they only go when necessary.