Dogs are cute, intelligent & can help humans out.
Yesterday I saw a blind/visually-impaired gentleman with a lovely Labrador helping him about. I'd like to see a Chicken do that.
My Uncle used to be a Police Officer, he was a dog handler. Alsatians (German Shepherds). They play a role in the apprehension of criminals.
Sniffer dogs, Sheep dogs (help out on the farm) and so on, so forth.
I understand what you mean, killing an animal is killing an animal. But Dogs have quite a special relationship with Humans and I say this as a person who prefers Cats. Cats can't do what Dogs can.
