What's Up Doc?

We brought Charly to the vet yesterday. He's been acting normal, except for he's been limping on his back hind leg for the past three weeks. The thing is, he's been going on all his walks, he's continued to run around and play with his brother Gus, and he's has had no problems jumping up onto our bed and back down again. Despite everything looking relatively fine, (except for his gate of course) we took him in.

A half hour later and the vet couldn't find anything wrong with him. She told us his muscles, his bones, his ligaments, everything was looking really healthy. So has Charly recently acquired a bad walking habit? Is this his new strutting style? His new runway walk? What the ???

By the way if you saw Charly today he'd look like the dog in this Doodle Dog painting! Seriously, you can't tell anything is wrong with him he's so energetic and exuberant.... except he's got kind of a funny walk...