Majority of the problem comes with those whom handle the dog from a young age.
I volunteer at an animal shelter near me, and I can tell you the way some people treat those animals that get "dumped" on our site, is a pure disgrace and they should be locked up for life.
Last year an emaciated dog (we still have no clue what breed he was) was dumped on to our shelter's doorsteps. He had many wounds, was covered from head to tail in ticks, had blisters on his paws, and eyes infected with a conjunctivitis like disease. The next night he was humanely destroyed, as he was having ceasures.
We did an autopsy on the dog, to find he not only had an inoperable cancer on his stomach, but arthritis had crippled his legs, he was also thoroughly malnourished and partly brain dead. It would have been cruel otherwise to have kept this dog, whom was very friendly despite his pain, alive.
As for dogs, no Martin they shouldn't be banned. I still believe they are, personally, the best type of pet you can have when growing up as a child.
I have had birds (breed them), cats, rabbits, guinea pigs, ferrets, fish, hermit crabs, etc. But honestly nothing beats a dog when it comes to having a pet.
Dogs as pets teach all family members about responsibility, as you have to groom them, feed them, exercise them daily, and to the way you interact with them etc.
All the others do teach responsibility, but dogs require that extra bit to get them over the line.
Unlike the others, you just can't leave a dog to its own accord, it requires constant attention, otherwise it will ruin and destroy everything in sight.
There are many breeds of dogs, asides from the bull terrier and chow varieties which have fantastic reputations, namely the Pugs, Golden Retrievers and Cavalier King Charles Spaniel. I own the latter, along with a labrador, and can tell you that our Spaniel is very trusting. Our neighbours always come around and take her out to play and walk. And only this week we had a foreigner in our house. She had never met him, but was in the guest room asleep with him from the night she met him. He was not keen on dogs, actually he was scared to death of them. Our dog changed that, two days later she was on his lap asleep. Or when he went up to his bed, he would call her name, and she'd be up there with him.