Ruger is about a year and a half old and around 75 to 80 pounds and we've noticed that his wrists bend inwards towards each other. They don't look too bad from a side view but head on you can really see how they bend in. They do not seem to cause him much pain if any at all and he has no problem sprinting around the backyard and climbing up and down the stairs and rocks chasing our other dog all day long. He does tend to have trouble trying to jump up onto my bed without having a running start but that may be due to his size and the fact that he knows I will pick him up if he gives me that certain look. Looking through old pictures I noticed that it has been present since we got him.
We got him from a local rescue when he was about two months old and it was only him and his brother left. His brother was a little bigger and leaner than Ruger and his ears were already standing up but he was very skittish and would not come near us. Ruger on the other hand was the runt of the litter. He was a little smaller, chubbier, and had floppy ears but he ran right up to us and was loving on us so we picked him. As a puppy we fed him California Natural puppy food and then switched to California Natural adult food at about 9 months old. A few months ago that brand was recalled so we switched him over to Replenish dog food as was advised by the woman at the pet store. He is in the backyard most of the day with plenty of sunlight so I don't think it is a case of Rickets due to a Vitamin D deficiency.
I was wondering if anyone has any idea what it could be. Here are some pictures for reference. The first picture is from the day we got him at about two months old and you can see how even back then they looked like they bent in and the rest are all recent.