His hips look super loose. Sometimes that can fixed with supplements, good food and the right kind of exercise. But I would definitely have him checked out by the vet.
ETA: Just read that you got him from a boarding kennel. My dog had very undeveloped muscles in his hind end when I adopted him and now you'd never know it. So it could be because he doesn't have good muscle mass built up. I still would recommend a vet visit though!
Ruth & the 4 Legged Rescue Gang
Rafi the malaroo
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Gio & Varda, the krazy kittens
....In my heart:
Last edited by BowWowMeow; 09-17-2012 at 11:00 PM.