Most dogs would be running across continents and looking after their own litters, not running around gardens and fields looking after their plastic toys. Don't you think it's cruel to confine animals to such small living environments?

We're essentially kidnapping them (and often castrating/spaying them) and abusing their natural instinct to seek security in the creature that feeds them, which should (in nature) be their mother or the pack.

How would we feel if an alien race came down, killed all of the humans they deemed threatening, took the weak ones and bred them for their own needs, then much later using their existences as emotional crutches and denying them the freedom to choose outside of an environment they can't comprehend?