The Monstar Wear Dog Collar is a collar that can be worn everyday, is easy to put on and comfortable for dogs to wear.
Sizing
S/M: Neck 9.5" - 18" (Chihuahua, Pug, Jack Russel)
M/L: Neck 19.5" - 26" (French Bulldog, Staffordshire Bullterrier, Bull Mastiff)
Inbetween sizes, go for the larger size.