Sometimes the age they are when you get them can make a difference. I have a puppy right now who is just turned 6 weeks yesterday, we have been partially hand raising him because Wonder decided she didn't really want to be a mommy. He was the only puppy in the litter. Puppies like this, or those that go to new homes early on are often more likely to display mouthy behavior, among other issues they sometimes have. Mr. Wonderful is not the first singleton pup I've raised, his father Howie was also an only puppy, though not orphaned, as was a grandson from Howie. Merlin, the grandson was extremely difficult to deal with. He was pushy, mouthy, and lord help you if he wasn't the center of attention. All because those important lessons were missed when he was young. I'm hoping to prevent that with Mr. Wonderful. We'll see. LoL, they each have their own personality