Okay, so maybe this is me, but there's something I find cruel about dog exercising.
Not the kind of thing where you take your dog to the park, run around, play fetch and have fun kind of exercise. That's all joy and wonder.
No, what I'm talking about is something like dog training.
I was walking through the park and I saw this big, brawny guy with his pet Staffy. The dog had a harness on and a number of heavy weights attached to it by a cord. The man would them call the dog over, getting it to run - lopsided because the weights wouldn't trail directly behind it - and he would time how long it took the dog to run to him each time.
Now, I know there are probably some good reasons for dog training, though the only one I could think of is Police Dog stuff, and this sure as hell wasn't that. This was just some guy who wanted his Staffy to have that really bulked up front look. Maybe to be a guard dog, maybe because he wanted a dog as bulky as him.
Either way, it seemed cruel to me to watch this dog hauling these weights behind it, clearly encumbered and uncomfortable, lopsided and pulling everything with its neck.