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Hi I'm Dr. Carole and I'm a small animal veterinarian. This can be common in puppies and believe it or not isn't usually something to worry about. It can happen because of sudden growth spurts and a difference in the growth of the bones and tendons/ligaments in the legs. It is called Carpal Laxity Syndrome. Here is an article on it.
Generally it will get better on its own but it is still suggested to have x rays taken of the legs to rule out any other growth or congenital abnormalities. Just make sure the puppy is getting good exercise on a surface that provides good traction. Also make sure the puppy is eating a good quality food to avoid any nutritional problems. If you have any other questions let me know. If you are satisfied with my response then please provide a rating by clicking on one of the stars. It is the only way I get credit for my response. Thanks