Getting my Pitbull more buff

Question
Hello,

I currently have a 6mo old Pit Bull Terrier. Shes the worlds biggest sweet heart, she's very tame and loves affection and attention. Everything is nice and good with her, my only question was: Whenever I see another PBT, or pictures of them online, they are usually much more muscular, and wide. I was wondering what can I do to get my dog wider and more muscular looking as well? I mean she goes to the park almost every single day, and is there for 1-2hours, just running and playing, I figured that might do it, but shes still kinda skinny.. Any tips?

Answer
I'm not sure if your aware of this but there are several types of pitbull dogs, The ones you seem to refering to as the wide muscalar ones sound just like the staffardshire bull terriers, what you are discruibing you have is a normal pitbull terreir, go to: www.dogbreedinfo.org and check out the staffardshire bull terrier and the american pitbull terrier. You can feed a higher protine dog food for more active dogs if you can find it in a brand you like.