Mr.B need be an only dog, as he does exhibit dog reaction and his pure size and strength requires a knowledgable handler who will not put him in any situation with other dogs or pets. He is very toy/prey driven which would be great for sport training, but makes him not eligible for a home with cats or any small pets. Mr.B does incredible off leash where other dogs are not present (for example walking the secluded vineyard, he will not leave your side, leash or not). He is moderate to low activity level. He needs daily exercise but tires quickly, although if you would like to go on a run or be active, he will keep up. Mr.B is a people dog, and one of the best we've had the privilege of working with!