This is the Caution I Will Bite Dog Collar - Size Medium - 2 inches wide and fits neck sizes 14 to 20 inches. Made right here in the USA from Yellow Dog Design. Keep your dog and others safe with this caution collar. 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 is given as a range of neck lengths. Measure your dog's 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, guaranteed to last dog collars have no rough edges, no threads to fray or break, no problem going in the wash, and no stress getting them on or off your dogs.