Can also see where he's coming from, however dismissing all exercises unless they're gundog work/ recall related is a bit shortsighted (IMO). Not all cockers are necessarily suited to working game, and similarly their owners may not be keen or suited. So there are other outlets for their need for stimulation and exercise - agility, obedience, tricks, playing ball, tracking, etc. Most border collies don't actually work sheep, yet thousands are kept happy doing a variety of other activities. Cockers are no different. Retrieving dummies as an isolated exercise serves no more real purpose than giving a paw.