Ace is a big powerful dog who has no idea of his own strength. For all his bravado, Ace most likely has not had an easy start in life and lacks confidence. When out of his comfort zone he can be fearful and react to different situations. He MUST have a home with a human companion who has had a great deal of experience working with dogs such as Ace and through that experience can read a dog's body language and act accordingly to guide Ace. Once Ace is comfortable he wants to be constantly by your side showing you how loving he is. He will certainly need an adult home as an only dog.