How can you tell if a cat is hurt?
How long has it been going on for? If the cat was injured I'm sure you would get some growling, yowling, hissing, maybe even a warning bite. But, if you're really worried, take the cat to the vet.
I have one cat that LOVES reiki, can't get enough of it, and she is a healer herself, you should feel how warm her paws get! My other kitty, only when she is sick.
However both my older girls do lay with my 17 year old dog when she is having a bad day. All I have to do is put a blanket on her and they will curl right up with her. All my girls supervise Bailey in her daily routines, from medicine to food. It's kinda funny there are always there when I do something new, wanting to inspect. LOL