I got this for my very headstrong, boisterous german shepherd bitch, aged 19 months. Have to say that it's not as easy as it looks. Firstly, getting the collar on her was a nightmare in itself, as she went mad when I tried, throwing herself around and howling. She really didn't like it at all!! After persevering, I have managed to finally get her to let me put it on her with the minimum of panic - but she still doesn't like it!! I struggle to attach the lead to the collar, as she makes such a big deal out of it, and it leaves us both quite distressed! I thought it would be much easier than it turned out to be, and am not sure that my dog will ever accept it quietly. We'll continue with it, and see how we get on, and I'll update my review accordingly.