there is a cat that has lived outside on my block ever since its owner moved away. It is sort of a communnity cat, I feed it and another house may put out some food as well. So today there is a rabies shot clinic at some vet and I was wondering if we should take her? I'm assuming the original owner probably had her vaccinated, but she might not have considering she wasn't responsible enough to take the cat with her. Is it harmful to get a second, or does the shot need to updated anyway? Also, will the people at the clinic be able to tell if she's already had one?