This is the Crazy Bones Dog Collar with Tag-A-Long ID Tag System - Size Medium - 3/4 inch wide and fits neck sizes 14 to 20 inches/4" wide from Yellow Dog Design, made right here in the USA. Keep your dog in the latest fashion with this stylish, functional and durable dog collar. TAG-A-LONG - This brand new, patent pending Pet ID Tag system is built right in to this dog collar. The Tag-A-Long system makes it easy to swap out ID tags from one collar to another, or to change ID Tags on the same collar. Perfect for when a special tag is needed at the dog park, on the beach, or as a service dog. We've included this special feature at no cost! EASY ON EASY OFF - Using a quick release clasp, the collar can easily be taken on or off the dog. Don't worry though, opposable thumbs are necessary to activate the quick release. SIZING: This dog collar utilizes a quick clasp closure, also called a side release clasp. Sizing is given as a range of neck lengths. Measure your dogs neck size or its current collar length (not including buckles) to obtain correct sizing. If you are shopping for designer, affordable dog/pet collars, then look no further. These durable. no threads to fray or break, no problem going in the wash, and no stress getting them on or off your dogs.