Hello New Member Here

[MastiffMan]

Hi Everyone glad to be a new member. Joined this forum to learn more about the breed. Always wanted one and i finally gotta a Pup.. His name is beefy.. . I had a few questions about him.. How would i know that he is pure bred. And also i noticed that his bone on his left side of his pelvic bone on the back side that seems larger then the other side . If someone can help that would be great.. i can  get pictures for these questions if needed.