I’ve actually used the growl and snap thing myself with my new puppy Maryjane when I saw how good it worked for my senior dog BB. It works sometimes but I dont get near the respect she does. That puppy knows her limits with her aunt BB.got home after being out for 3 hours, young Ivan spent his first time in the kennel with me gone...he did great, no yapping of crapping the floor...he's outside learning from dutch...dutch is quick to correct with a deep growl and a snap...life is so good...