Favoring front limb after exercise

[Guest guest]

I have a 9 year old Labrador, mildly overweight, who tends to favor the left

front limb after exercise. He is better when on Rimadyl, but still favors. I

have evaluated all joints, taken radiographs, but can find no significant

issues.

When the dog sits or stands, he tends to posture the paw in a manner you see

pups with poor nutrition. Sightly flexed at the carpus and on the toes. Any

ideas out there?