Does your dog have a thick neck and a narrow head ? Do you have trouble finding a collar that won't pull over your dogs head if he resists you ? Are you currently using a choke collar to prevent losing your dog because he slips out of his collar ? Dalmations, greyhounds, shepherd mixes, vizulas, weimaraners, and puppies of all breeds, are some of the more common types of dogs who have this problems with their collars. Martingale collars are like regular collars but with out any buckles or snaps. They slip over the dogs head and can be adjusted for comfort. When the dog pulls or tries to back out of the collar, the collar tightens to fit the neck exactly but does not choke the dog. It is sometimes called a limited choke or limited slip collar because it tightens without choking the dog or coming off over his head. Lupine is probably the very best maker of dog collars on the market and this product is no exception. It's sturdy construction and design will last through years of rough treatment. They come in a variety of styles, colors and designs including a regular snap, adjustable collar. The dogs at our house get their collars washed on a regular basis with no problems, the colors don't fade and the patterns don't loose their luster. In fact, they look like new ! Our mom loves the variable colors and patterns and is constantly threatening to make us all wear matching collars (which we think is geeky and embarrassing !), but she's got a collar fetish and she just can't resist buying them. The price of $10.00 is just right for this 'cadillac of dog collars', and if you're anything like our Mom you'll have a collection of collars before you know it.