HUNGARIAN WEIGHT PULLING DOGS : SEE THEM SWEAT AND STRAIN! : IS THIS ANIMAL ABUSE?

I didn't know if I should be sorry for these dogs or proud of them! Researching a bit about "Hungarian Dogs" I found this video! Crazy?! I want to know more about this subject! I told some friends about this video and others like it and they said "That's Animal Cruelty." Anyone want to leave an opinion?