S: Neck girth: 21-34cm ; Width: 1.5cm 

(Yorkshire Terrier, Maltese, Shih Tzu, Lhasa Apso, Poodle)

M: Neck girth: 30-48cm ; Width: 2.0cm  

(Pug, French Bulldog, Beagle, Indie)

L: Neck girth: 38-60cm ; Width: 2.5cm

(Labrador , Husky, German Shepherd, Golden Retriever )