How Can I Build Up My Pitbulls Muscle's?

Give him exercise and good healthy dog food. Take him in to  get a check-up yearly if he is young. If he is old, twice a year would be better. :)

I raise all natural pitbulls, no vitamins, no supplements. Just lem them grow up on their own. You can let it run on a log chain all day and let it run alot. I always give my dog's hamburger or steak once a month for protein and I put chicken broth in their food to make them eat more and it gives them more protein. Protein is everything and then let them work out.

One way my dad does to build up his purebred female pitbull is when he walks her, he uses two leashes. Then attaches bricks to each end of the leash. Small red bricks when she was a puppy and large gray bricks now. All you have to do is let her/him drag them down the street. And the good thing is if you put enough weight, he/she wont be able to run away. Im glad I could help!