I was given a male American pit bull terrier and he was born 9-12-08. I got him 2 weeks ago and he was 100% fine, About 4 days ago he started to walk oddly on his paws and then up to his ankle joint. At first his toes on the the outside of his 2 front paws would curve out like all his weight was on them. Then he started to walk with his front legs almost in front of him not under him. Then he walked with his paws folded under, what is going on with him? It's not hot ever and it has never been swollen. I called the breeder and they said another puppy owner had the same problem and went to the vets and were told he was double jointed and would grow out of it. Is he badly bred? I have his parents U.K.C # I have not yet reg my pup but also have his #'s.....Can any one help me? I have before and recent pics of how his legs look.
This sounds like what they call "rickets" in dogs. You have a breed that is heavily built. You must stop feeding puppy food and switch to either a good quality ADULT dog food or a food specifically formulated for LARGE BREED PUPPIES. When a large-breed pup is fed a normal puppy food too much goes into muscle development and not enough into its skeleton resulting in bones that cannot support the dog. It often shows up first as bent legs like you described. The dog also needs a lot of sunshine and outdoor play time to help strengthen the bones. With the right diet, sunshine and exercise the problem will often dramatically correct itself in a couple of months. Sometimes it won't and braces may be needed. Please check with your vet as there are some other problems that can cause bent legs but rickets is one problem I hear of all the time.
There's no such thing as being "double jointed." If a vet actually said that, I'd find a new vet. There is "hypermobility," a condition wherein joints can move beyond their normal range. If your pup is hypermobile, there's not much you can do about it but take extra care to protect the joints.
If you haven't already, take your dog to his vet and express your concerns. With all due respect to arachyd1, this doesn't sound like rickets to me, as you don't mention any bowing/bending of the leg bones or swollen joints (unless I'm misinterpreting?), both typical signs of rickets, which causes a softening of the bones. It could be a case of muscle development overtaking skeletal development which is a concern in heavily-built dogs.
There are so many things it could be. Your vet will be able to narrow things down. Personally, I wouldn't trust that he will "grow out of it."