back legs of my 8 weeks rottweiler puppy
I noticed that my 8 weeks rottweiler puppy falls on his back legs when running or walking easily, is it normal for that age ???
That's difficult to answer without actually seeing the puppy 'in action'! It could just be normal puppy awkwardness, or it could be something else.
At 8 weeks your pup is still a baby and Rottweiler puppies tend to be clumsy as babies and even as adolescents their rapidly growing limbs can make them seem awkward.
If you're worried about his hips, I think it's too early to be concerned, but check out my Hip Dysplasia In Dogs page to learn what symptoms to look for.
At 8 weeks it would be unlikely that hip problems would be evident unless the pup was a very severe case. My personal opinion would be that it's just normal puppy stuff, but if you're at all concerned have your vet check him out to be sure.
There are other neurological, spinal and similar problems than can cause weakness in the rear legs, but they're not very common and only a vet could make that type of diagnosis.
Hope this helps some, I wish you the best of luck with your puppy.