Collars aren't right for every dog- if your dog needs the security of a harness, the Spindrift Step-In Harness is a great option. Forget buckles and pulling on over the head, this harness is designed to be put on in one easy step: Just lay harness flat on the floor, then walk your dog over the harness and lift the harness up, buckling the quick-release clip over the shoulders. Our favorite feature about this harness is that the pressure is totally transferred from the buckle to the solid metal snap of your leash, via a double ring closure. The Step-in Harness is a great solution for puppies in training, determined leash pullers, and dogs who slip their collar over their head. Features: *Round Edges - Tubular nylon has no edges to irritate. *Stainless steel D-rings and slides. *Double ring closure prevents possibility of buckle failure. *No part of the harness rests over the trachea or esophagus **Note that harnesses are sized by dog's girth (the total girth of the dog's chest, when measurement is taken just behind elbows)* Sizing: SM: 14" - 21" MD: 19" - 30" LG: 30" - 40"