The main problem that I have is that we rescued both of our dogs, the big one from an animal shelter that he had been in for two months because he was already an adult, and the other we rescued after he had been left tied to a tree and abandoned. It was pretty obvious that they had both been abused and neglected, and our big dog has separation anxiety. So, they don\'t have the perfect background, and one has an actual problem with being left alone. It\'s not anything any amount of training can cure, we just make sure he gets plenty of love and attention and leave some kong toys with puppy treats or frozen peanut butter in them when we leave to help keep them occupied.