Hard to say without papers to research his heritage. He was big boy for sure, and definitely had some bully in him... maybe had some mastiff as well?? The nose color is nothing more than color, just as humans have different colors of hair, same with the nails/pads, just some dogs have white nails, some have black, it doesn't really define anything as far as breed or anything. The APBT is not as large of a breed as some think. Generally, a pure bred APBT will weigh between 45-65 pounds. The bulkier "bully" breeds, such as the American Bully, are much stockier and have a broader chest and shorter legs. Welcome to the forum, take a look around and feel free to post up pictures of your boy, he was definitely a beauty!!