go buy a tub of protein power, like kreyotein(SP) and mix a cup of it in his food everyday, for the first week only put a little bit in and then after he has had it run through his sytem a few times u can add more an he will buff up quick, then take him for a jog lol it wont harm the dog at all plus its a pit they have industructible stomachs i watch pits eat sticks, chicken bones, all the time they dont care, pits will eat everything there invincible, but yea my freind has done it to about 5 of his dogs and well here is the result....his names tiger, hes a beast but freindly as can be, unless u wanna jump into his yard in the middle of the night ha, you can see all his muslce in the second pic, we play with him like that all day, he likes the stick more than what he put on it