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My dad is also a vet. He has been giving our Labradors glucosamine every morning for a while, and it helps quite a bit. Also, we stopped letting our dogs jump down from the truck beds. That puts a lot of pressure on the front elbows. Up is fine, but we lift them down now. Food for thought!
Per the recommendations here, I've been giving him glucosamine the last few weeks with every meal, and it has made a huge difference. He's ran like a demon the last couple hunts, just like his old self. Thanks!