My horse has been really stiff at the beginning of rides lately. His gates are more choppy than usual and he doesn't want to move out. With a slightly longer warm up he limbers up just fine and is his old self. This is a problem I had before when he was in the stall more often, but since he has been in the pasture 24/7 it has not been a problem. I have two theories, one-the grass in the pasture is pretty much gone for the winter, so he is mostly standing at the round bale rather than going between foraging and the bale, decreasing his movement and increasing his stiffness. Two-he is just getting older and his racehorse days are catching up to his joints. Should I consider a joint supplement? Or talk to my vet? Or just give him the long warm up and not worry so much?