I have a BO Roo. He is about 4 years old. For a few days now he has been walking around all stiff like(like his legs hurt). But when you first go in the coop or near him when his is laying down, he has a terrible time getting up. He tries to get up but he falls over and flops around like his is going to die, but once he gets his legs under him he seems fine, less the way he walks. What can possibly be wrong with him. He does not act ill, or nothing like that, it is just his walking and getting up after he has been resting.