Anyone who has owned a dog knows FULL-WELL that if a dog doesn’t like something, they are NOT SHY about letting you know it...often to the point of painfully knowing it, if you go too far. For the Lab in the picture, it probably felt more like a massage.
In Hong Kong to get a (fully clothed - don’t get ideas) petite Chinese girl to walk all over your back like that costs money. And yes, it’s one of the best massages you’ll ever have.