Yeah, I'm failing to understand how this would work for teaching a longer hold. I could see this effectively training the dog to spit the dumbbell out. Not hold it as they should. But, I'm also not out to reinvent the wheel. I prefer Hunting Retriever methods because they work and work well.. People hear the word force in relation to retrieve and wig out. I have never seen a hunting retriever lose hold of something when they're trained with a good force fetch system.