Just to play devil's advocate.
1) There's a definite, proven psychological benefit to owning a pet. Dogs in most cases rate at the higher end of the scale here. Result, people feel better, many probably live longer because of it. In our age of obesity, dogs are a source of exercise for their owners. Maybe not much in many cases, but every little bit helps. 2) Dogs have been known to save lives. Getting someone's attention in case of fire, coming to the rescue of child, waking someone from sleep for whatever. 3) Dogs have had a long history of working in emergency services. Smelling out drugs, smelling out explosives, sacrificing themselves for their handlers/owners and other things I can't think of right now. 4) Dogs usually protect their environment against thieves, owner's property or perhaps someone who would harm a family child.Everything that Hax Planx has said is true and more. I think the biggest problem though isn't dogs, it's by far the people that own them and don't control them. Sure, let your dogs piss every five feet wherever they travel, I enjoy going out in the winter and seeing yellow snow everywhere. Let them s*it on the sidewalk or a neighbours lawn without pooping and scooping. It's manure right? You're just helping out your neighbour. Let them run wild getting into garbage cans. Your neighbour must not have packaged his garbage properly, so that's not the dog's fault, right? Certainly not your fault for letting the dog run free. And yes, it's alright to abandon your dog when it's sick or you just don't want it anymore. It's not your fault it got old. Beat your dogs or just be plain mean to them, turning them into gnashing, aggressive animals. Anybody like the postman or a girl-guide selling cookies who comes into your yard should know better, right?
BUT, THERE IS A SOLUTION!!!! Let's get rid of dog owners. Then the dog problem will go away, right? I mean, what possible good does a dog owner do? He's a waste of air and a drain on the economy. At the very least, we should be neutering and spaying dog owners, not their dogs. That would fix the problem. Don't you think?
:)