My name is Duke!

Duke is almost a year old and is very sweet and loving to people. He loves to play with toys and tennis balls. Duke is obsessed with getting his belly rubbed and will fall over onto his back at any opportunity. He likes head scratches too. He behaves with the other two dogs on the property and the cat on the property. Unfortunately he seems to want to eat/attack other dogs/animals. We have tried hiring a trainer to break him of this aggressive behavior without any progress in the last couple of months. He is a large dog and too strong for my kids and I to handle.