I was given a 10 month old American Bull Dog pup today

I've been working with her for a few weeks, she's from a puppy store that my aunt works at. Her story is that someone special ordered her, and then when she came in at 8 weeks old, they didn't like her coloring so turned her down. She's been at the store ever since because she was a bit of a wild child.
2 or 3 weeks ago I offered to take her up here to the track to let her run around and get all of her pent up energy out. The poor dog had never actually run before! She had a blast, and we started doing that a few times a week. Now she's attached to me, I love her to death, and the store gave her to me for free so she would have a good home
Oh yeah, her name is Dahlia.