Just a thought... luxating patella?
I experienced the exact same thing with my dog, Moose. He yelped when we picked him up, only occasionally, and was scooting/limping his leg on and off. It turned out to be luxating patella in both back legs! He would also sometimes yelp out of nowhere while he was playing. After a couple weeks of this we took him to the vet and he was immediately diagnosed...worth a check-up at the vet because the longer luxating patella goes on the worse it gets! Hope this helps! |