Yesterday we took the dogs for a hike and Jake started limping after he jumped out of the back of the truck. He completed the hike, but he limped the whole way. Now he's not bearing any weight at all on his left back foot.

We've felt all over his leg and paw and hip, bending and straightening them and rubbing everywhere. Nothing seems tender, and everything straightens and bends OK. There isn't any warmth or swelling anywhere.

What could abe the matter?