My puppy was such a well-behaved dog when he first came to our house as a 10 week old. Then things have started to go to the opposite way when he hit the adolescence. I even thought that getting a GSD maybe wasn't for me and I should have got a French Bulldog instead. 😀 His biting problem was getting out of hand, he was becoming an utterly disobedient pup. Then I watched one of Larry Krohn's videos and he would say I should correct his unwanted behaviors, not try to redirect etc. Saying a loud "No!", grabbing the back of his neck seemed like working. But they were not 100 % effective. Then the other day I used a bonker for the first time while he was getting loud and reactive right before our regular evening hike. At first it seemed like he thought the bonker was a toy and tried to play with it. Then I applied it a second and third time. His "spoiled kid" manners disappeared instantly. I didn't even need to use the bonker another time since then but his leash reactivity is now gone almost 80 %, he immediately sits when I say "sit" (I realized the reason he wouldn't sit wasn't his lack of knowledge of the command but was his stubbornness), his nonsense in the crate (he would try to "dig" the platform beneath the crate) is almost totally gone. Also it seems he now knows I mean business when I say "No!". I feel like he respects me more but he's still confident and happy. I don't think using a bonker couple of times has messed up my relationship with him. Our relationship is now much better and it seems he now respects me as his leader. I don't understand why people think trainers like Gary Wilkes or Jeff Gellman are abusive trainers just because they recommend the use of a bonker. The bonker won't hurt your dog, it won't hurt his feelings and will make you a happier dog owner. That's my two cents.