my sisters female lab had it. when she was young she had a funny sway, just off enough to where if you've been around dogs enough you think "what a funny sway" as she got older you could tell when she would run and junp, she fell and stumbled all the time... it was a progressive disease that went from a "funny sway" to not being able to squat to use the restroom or climb stairs, or hardly get up lay down, i'm talking less than a year.... we had her put to sleep..... surgery was too expensive, they wanted over two grand where we went...