Dogs evolved alongside humans and were bred to help us with specific tasks like hunting, herding, etc. When you take an animal with a genetic drive to perform certain activities and turn it into a fashion accessory or have it sit alone in a house most of the day, I think the dog tends to go a little crazy. I don't think it's a good life for them. If you can't realistically be with your dog most of the time, or if you don't have a purpose for the dog (like herding sheep) you probably shouldn't have a dog.