Thanks i too think it is an injury but cant find the source. I have felt and looked all over. he does not like to put pressure on it but will just a bit to get to food and such. I feel so bad.
I hope it's just a strain. Just so he doesn't over work it, hopefully he should be better in a few days. I've had girls do that and they'll limp a couple of days. Let's hope it's just that!