Why do Mexicans hate and treat dogs like crap?

Here in America the white people allow their pets, especially dogs to sleep on top of their bed. They feed them scraps of food under their family table during dinner and take them to the vet weekly and groom them too. Then comes Mexico where all the dogs are in the streets,hungry, used for fights, and killed. “The greatness of a nation and its moral progress can be judged by the way its animals are treated”- Gandhi