My dog keeps falling down on his back legs. He already has been diagnosed with hip dysplesia… but i remember a vet a couple of years ago about telling me about a disorder that is promenent in “working” dogs where they do this . He does not show any pain or discomfort when this happens, just annoyance, i have him on meds… but i cannnot remember what the disorder was that she called it which if i remember right sounds spot on. Is there anyone who might know what this is aside from dysplaisa? Thanks