I bought this collar for all three of my Australian Shepherds and we LOVE it! I’ve owned Aussies for more than thirty years, and this collar is the only one I’ve tried that does not cause mats around the neck area. It is easy to fit and does not slip. The leash attachment is easy to find in a long coated dog, which I appreciate so much when I am trying to get three of them leashed and out the door. This collar is sturdy and tough but lightweight; I can even leave it on for baths because it dries so quickly. Can’t imagine I’ll ever need any other kind of collar than the RuffWear Knot-a-Collar.