this is probably a question best asked to your vet.. some breeds are more prone to hip dysplasia.. and if you know the parents history that is a good idea..

they may show pain or poor walking and poor gait.

from experience with my pit bull she did alright at 6 months of age when i got her then suddenly i came home from school oneday and she was having trouble walking. my best guess was that her and my other dog has been playing too rough and she sprained something but i took her to the vet and they recommended xrays so i did that and she both of her rear hips were partially sublaxated(dislocated)....it was hip displasia and it was severe enough to require surgery. so when doing my own research genetic hip displaysia can be detected in puppies as early as 7-12 months my pup was 8 months old when i found out. and she always had a unique gait but since she had an abusive past and not much pain i just never noticed. it came on suddenly and she was in so much pain that she could not bear any weight on one leg and very little on the other. going from the sitting position to standing was nearly impossible and when trying to touch the rear legs she just didn't want me near them. also commonly noticed can be an arching of the spine in your dogs' rear end mine became very prominate. i hope i have helped you in some way...

if you suspect hip displasia go straight to your vet and get a physical exam and from there they may suggest xrays..this is the only sure way to know what's going on. but if it is hip displaysia then your dog will have very severe pain if left untreated so please just seek professional help.

Less energy and movement; difficulty rising; lameness in the back legs; reluctance to use stairs (particularly to go up); reluctance to jump or stand on hind limbs; swaggering gait, bunny-hopping gait; soreness after lying down; soreness after heavy exercise.

These are all the symptoms of hip dyspepsia. You can however treat this condition with proper diet and food supplements. I have a friend who had her dog get run over by a truck. The vet said to put the dog down but my friend took her home instead. She put her on these agility supplements www.HealthyPetFriends.com, and within about a week the dog was starting to walk again and in about a month she was running and playing :)

She got x-rays done and the vet could not believe her eyes!