About our gear: Our Biothane® collars are waterproof, stink-proof, highly-durable, soft to the touch, and feature a variety of color choices! Best of all, a quick rinse under water is all it takes to get your collar looking new again. Because we demand the best, all hardware used is solid brass, meaning no matter how wild your adventures get, you will never have to worry about rust. Our collars are made to last. 🐶 Our 1.5" BioThane slip collars are only recommended for medium-XL dogs. These are not recommended for dogs with very thin or weak necks, or excessive pullers. At it's maximum adjustment, the collar should be loose enough for your pup to slip it's head through. Please be sure to double check your pup's collar size! Ensuring size is the responsibility of the buyer and we do not accept returns or exchanges on products where the wrong size is selected. To properly measure your dog's current collar, lay it flat and measure from the center bar of the buckle to the hole you use for proper fit. It's always best to measure twice just to be sure!