L-O-V-E this collar!!! My most favorite one I have ever purchased for a pet! After volunteering as a foster home for a dog rescue I knew I wanted a martingale style collar for my own dog who is a puller when leash walking (beagle-husky mix!). This has helped a bit with that. We also got a new 70 pound ?Black Mouth Cur? who walks great on a leash, but tries to escape from time-to-time. This also works brilliantly on him. I specifically chose these Red Dingo ones because they are reflective - like super reflective, more than most others AND because the have a super cute design, hahaha! I mean they wear their collars 24/7, why not have some style!!! Thanks Red Dingo for making the perfect collar!!! *My only con is not collar related. It's just that shipping took a bit of time. Which is expected since the collars came from Germany, I believe, to the U.S. Once I realized where the shipped from I was fine with the time-frame. Just want to caution people in case they are in need of something ASAP.