My Pit Bull puppy is 7 weeks old. She had her 6 week shots. She eats fine and plays normal. Her only issue is she has to pee every hour. We noticed she has a bump on the right side of her stomach. It's about the size of a dime. After she eats a lot the left side of her stomach is considerably larger than the right side. Could the spot be a tumor on her bladder? Or is there another reason why she needs to potty so often instead of every 4-6 hours like other puppies her age?