Adjustable Leather Dog Muzzle Stop Dog Barking Bite Muzzle Small Large German Shepherd Dog Obedience Training Muzzle Size:Fit for Dog size S-M (Color Brown) Muzzle Deep:2.60"-2.75"/6.5-7cm The smallest of the circumference: 7.87"-9.05"/ 20-23CM The largest of the circumference: 9.84"-11.02"/25-28CM Collar Length: 14.2"/36CM