They did think of making dog owners pass a test here in the UK but there was so much public outcry, the idea was abandoned. I did not think it was a good idea simply because it would penalise elderly people who have a little dog for company.
However, that said, with the best will in the world, people could pass a "dog" test, get a dog then lose interest and totally neglect it.
I help with dog rescue (my two are both rescues) and have seen this so many times.
Last year when we decided to get a companion dog for Max, we visited one dog at our local RSPCA Cat & Dog home.
He was a beautiful long-haired German Shepherd, but what a sad story he had.
The owners had bought him as a pup (would have cost them between £350 and £700). They lost interest in him very quickly so locked him in a shed, no food or water. Neighbours realised there was a dog there when they heard him whimpering. The RSPCA were called in. When they found the poor dog, he was skin and bone and completely unsocialised and aggressive (can't blame him, poor thing).
He managed to survive by licking condensation off the walls or rainwater that had got in.
He had been lying in his own urine and faeces and his legs and underside were a mass of open, weeping sores.
They nursed him back to health and began the long process of getting him socialised with humans, animals and just everyday living. Once they got him to a certain level, the started the very hard task of finding him a good home. The had strict rules about this one and insisted that whoever adopted him would have to carry on training with their behaviourist so would have to live within a radius of a few miles of the home (we were too far away at 40 miles out of zone).
They eventually found that special home for him and he was adopted earlier this year

He is coming on very well but still has a long way to go but he is a very much loved dog now.
My own GSD, Buddy also had a horror story. He was a victim of appalling abuse. He is a purebred German Shepherd and absolutely beautiful both in looks and temperament - except for his ears. He looks like he has teddybear ears. His previous owners, sheer and utter scum, cut his ears. They must have muzzled him to do it as he is absolutely terrified if he sees a muzzle and will wet himself. He is also missing a dew claw which looks like it has been pulled out by the root and not accidental. He was only a pup

How they could have done that to him is beyond my comprehension. He is the most gentle and loving dog you could meet. The only thing he does is he will growl and old, grey-haired men and tallish women with dark, shoulder length hair. Obviously they remind him of something he'd rather forget. He is not as bad as he was when we got him just over a year ago as he's learned not everyone is bad and if he does start to kick off a quick "No!" and little tug on his leash and he stops.
Max was abandoned in the middle of traffic. Other than that, we know nothing of his background except he wasn't socialised and that we are working on with the help of a professional.
Our dogs are our family. Wherever we go, they go too. I would not dream of going on holiday and tying my dogs up. We enjoy their company. We enjoy seeing them enjoy themselves. I love the way, even if I just pop out for a few minutes the welcome I get - tails wagging like mad and the two of them with silly grins on their faces.
Buddy especially. When I look at the pic I first saw of him on the internet, just standing there, his head down looking so sad and bewildered and seeing him now, happy, gaining in confidence every day...ahh...well you know

Simply put, we love our dogs and cats dearly - and we know they love us unconditionally in return.
Just a shame there are some pathetic people on this planet that don't feel the same way.
Another thing people must guard against is leaving dogs in cars in hot weather. If we take our dogs in the car just now I run the car for several minutes before putting the dogs in so the air conditioning cools the air down and we NEVER leave the dogs in the car. They are out of the car as soon as we reach our destination.
People don't realise it takes less than 20 minutes in a boiling hot car for a dog to die a horrible, cruel death.
Please, please, please NEVER leave a dog in a car in hot weather and if you see a dog left in a car that's in distress, call the police, animal cruelty or break your way into the car and rescue the dog.
That dog might only have minutes left to live.