x2 but OP, maybe try the steroid forum? In general you will find more steroid knowledge there, potentially increasing your chance at a knowledgeable response to your dog question.
I also agree with the diet and exercise sentiment. Feed him real food, not the bagged or can stuff.
He'll probably eat any kind of meat you cook for yourself, throw an extra breast or chop on the grill for him. And I've found with my dogs, If I blend fruits and veggies with fish oil they will eat it.
And of course adequate exercise. I'm not a dog expert but I do have some bulldogs trained to catch big game and they do well on real food and intense exercise. Never had an issue.
I guess it makes sense there could be some low T dogs though, never really thought about it.