Big dog?

[Scythe13]

Steroids. Haha, I'm kidding.

It's the same thing I say to guys in the gym that are naturally packing on muscle, if what you're doing is working a treat, stick with it.

Adding extra weight to him may cause joint wear when he runs, much faster. It's not going to be caused by the extra muscle, because muscle really doesn't weigh more than fat. Jusy stick to what you're doing.

Have you thought of showing him? If he's that good a dog, show him, then stud him for a wad of cash!