My 8 month old bitch sometimes limps when she gets up after sleeping. It doesn't happen all the time and I never see it once she has been up and moving around for a little while. It is definitely in the front. I plan to take her to the vet when the closing date on my credit card is past. Until then, I will worry & wonder if anyone else has an idea what might be going on.
Good luck. I had a girl that limped like that as well after resting, but then once she got going she would quit. My regular vet diagnosed pano. I never did like how she moved in the front. Her OFA's at 24 months revealed Grade 2 ED and DJD in both elbows. She as immediately spayed. Hope you are luckier than I was.