I have a siamese kitty who has been limping for the past two days. He is an indoor cat, so there is not much he could get hurt on, (perhaps a thorn from my roses pricked his paw). I checked his paw for a cut, but I didn't see anything at all and he doesn't seem like it hurts if I rub his leg. Should I take him to the vet, or give it a couple of day to see if it gets better?