I'm not an experienced trainer but I have worked with one for a couple of months. The issue of treats is a question of seduction vs compellation. For most important commands, the dog needs to be complelled to do what you say. For this we have been using a "nick collar" and its very effective and humane if you use your head and have the variable output adjustments. When you use treats, you are basically seducing your dog into doing something you want. If on occasion the dog doesn't feel like a treat is important, you are screwed. The dog is actually doing what he/she wants on his/her own terms. The nick collar enforces who is alpha. I would however recommend that you work with an experienced trainer if you use the collar, and for heaven's sake never touch it if you're in a bad mood.