When are people going to learn that a dog is not of the same nature as humans? They own the teeth of an animal who kills other animals. A dog is submissive to its owner because the owner is the "top dog", a dog would like to kill something to please its owner. It would like to tear the leg off passing bikers and walkers, because it is defending its territory. The dog is giving itself points for these things that are dangerous to our society.
No doubt, dogs can and do help humans, as companions, as ears for the deaf and eyes for the blind, as herding animals, as beasts of burden, as retrievers. The happiest dogs I see are ones that know exactly what is expected of them, dogs with training, dogs with a task. The dogs that frighten me are the ones that are left to wander the neighbourhood unguided, no rules, up to their own devises. A dog will not stop at getting into garbage cans, eating chickens and digging holes, get two or more together and they are a threat to human life. When I was a teenager, a 16- year old boy was killed by his friend's Doberman pinscher. I know Portland recently had a similar tragedy involving a younger boy. A friend of mine who is a nurse for a pediatric brain surgeon in Portland, is often caring for a child mauled by a dog. Losing four sheep is a sad story. Losing a child will be a tragedy.
When I read the article about the chow who attacked another dog that was on a leash, I wondered if I was walking with my child, if I could have defended her from an aggressive large dog.
Dog owners, love your animals, care for them, discipline them but don't let them run free. Please look at the bigger picture.