Should I be concerned about my cat? He is a 2y.o. neutered male (DSH) who has recently (last 3-4 days) shown signs of limping on his right-hind leg. He still places some pressure on the leg but doesn't jump or run anymore (but he will trot). He eats fine, drinks fine, attempts to play and shows no sign of hiding but does still let out a cry if he jumps down from something.