@Anneke, HANG IN THERE!! Thank you for kind words, and do not give up, nor be hard on yourself. Working to help an aggressive dog is NOT easy, and most of us have to learn from scratch how to best approach it. I know, i have made mistakes with Buddy, but, Buddy always stands ready to give me another chance to do better. I so so so *hope* that you will also see the difference from walking Cooper in a heel, that i witnessed with Buddy. I hope hope hope i am not setting you up for a disappointment, that just crossed my mind, that i might be doing that. Cuz all dogs are different, and what helps one dog, might not help another, and last thing i want to do, is set you up for a disappointment, like, if you do walk Cooper for 2 months in a heel everytime, and then, if Cooper is not a bit better, it might break your heart cuz i have set you up to expect improvement. So, i might have done wrong there, to set you up like that, so it's only fair, to caution, it did not 'cure' Buddy, nope nope nope, ha ha, nope, my lil dog is still a gangsta, but, he IS better. And you walking Cooper only in a heel, (while providing him chances to run full speed somewhere else) *might* not bring the improvement i did witness in Buddy, cuz all dogs are different. And it is obvious, you are a soft-hearted person, and if Cooper is not better, after all my insistance you give it a try, well, then, maybe i've set you up for a let-down, so try not to have a let-down, if i am full of baloney, okay??? and if you find things that do help Cooper, please also share the idea, so i can also try that on Buddy, too. AT any rate, Anneke, i have zero doubt, that you are doing the best anyone could for Cooper, no doubt in my mind, that you are trying your best, and sorting your way to find what helps your dog. It is so nice to discuss dog-aggression with someone who is trying as hard as you are, and thinking about it, as much as you are. That right there, is huge plus for Cooper, your willingness to find the best way to help him. DON'T GIVE UP, I am sure you are making progress!! btw, Buddy *only* gets the treat when he looks right at my eyes. I have made mistakes on that cue, by accidentally treating him for looking AT THE TREAT, but, luckily, Buddy stands ready to let me get it right, so i was able to correct my error there. I practice, with the treats held out in each arm, far out to my sides, see? And Buddy has to bring his gaze away from the yummy treats, onto MY FACE, "LOOK AT ME"..... not the treats in each hand.... THEN he gets click/treat. I then move treats even closer to HIS face/mouth, still, Buddy has to look at MY FACE, not the treat so close to his face, to get the click/treat. Then, over time, once Buddy understands, "ohhh, i have to look at HER to get the treat, okayyyyy, got it." THEN i ask for a longer look at my face, before i click/treat. HOpe that helps Cooper get the hang of it. worth a try. in the presence of enemy dogs, i DO also squat down, to make it easier for him to put his att'n on my face, which IS now right in front of HIS face....sometimes i stay standing up, but, more often, i squat down in front of Buddy, with Buddy's BACK to the enemy dog. but oh dawg, Anneke, you are sooooooooo right, working with a dog with issues, SURE DOES TAKE TIME, that is yet another thing we who have 'special' dogs learn, is PATIENCE and PERSISTANCE!! HA HA!!