I recently rescued two male cat's that are about six years old. I plan to take them to the vet at the same time to get a overall exam plus vaccinations before I can schedule their neuter. My question is how safe is the rabies vaccination on a older kitty? I know I'll have to get it for them regardless I'm just very nervous about it. I was the same way about their flea treatment. When you read about it online you just see nothing but horror stories about how it killed someone's cat, and not to do it. I'm probably just worrying myself to much over nothing, but I was just curious if anyone had any experience with it.