look at the title of the thread it says pit bulls and pit bull mixes
..old game line pit bulls can and will be under 30 pounds with a proper diet , exercise and training... on a chain the dog would be much heavier... those same dogs often were duel registered as pitbull with one registry and am-staff with AKC and still are... I do agree people should learn the bread of there dogs.. american bullies are not pitbulls, but I would consider it a pitbull mix they are just mutts really.. in the early 1800's some breeders started breeding baiting and fighting bulldogs with the gamest , quickest most agile terriers they could find, they were called Bull-and-terriers or half-n-halfs... those dogs where later called pitbulls and selectively breed to create the two lines amstaff and staffy both pitbulls bread to different standers of perfection ... Akc wouldn't recognize pitbulls as a breed because of the fighting history and made them register under amstaffs.. its all a big bumfuddle ... you can read three different books and get three different stories.....