
My first dachsie has one foot that turn out but that is due to him jumping off the wall I had him stood on grooming him, he started to limp so took him to the vet, she couldn't find anything wrong and wasn't limping for her, he eventually stopped limping but that paw was turned out when fully mature, did speak to a vet and he said he had probably damaged the growth plate in one of the bones in his forearm and it had either stopped growing or the bone carried on growing for longer than was normal.
I would look at the possibility of trauma causing your dogs problem, inherited developmental faults are usually bilateral rather than unilateral.