Jeepers! That vet had a negative attitude! I don't know the vet personally or what he did for the other cats, so I hope I'm not misjudging or stepping on toes. But I personally, wouldn't bring any of my cats back. If he has the attitude that you should put a cat to sleep that easily, who's to say that he'll try hard if your other cats are in dire need? What if you bring your cat in and it can be saved, but he thinks it's better off dead so he doesn't do all he can do?