Best FitŪ Mesh Muzzle Black "Size 1" For Tiny Dogs (Up to 7 lbs) Best FitŪ Mesh Muzzle Black "Size 2" For Miniature Dogs (7-12 lbs) Best FitŪ Mesh Muzzle Black "Size 3" For Small Dogs (12-24 lbs) Best FitŪ Mesh Muzzle Black "Size 4" For Medium Dogs (24-48 lbs) Best FitŪ Mesh Muzzle Black "Size 5" For Medium Dogs (48-60 lbs) Best FitŪ Mesh Muzzle Black "Size 6" For Standard Dogs (60-80 lbs) Best FitŪ Mesh Muzzle Black "Size 7" For Large Dogs (80-100 lbs) Best FitŪ Mesh Muzzle Black "Size 7XL" For Large Dogs (100-120 lbs) Best FitŪ Mesh Muzzle Black "Size 8" For Large Short Nosed Dogs (120-155 lbs) Best FitŪ Mesh Muzzle Black "Size 8XL" For X-Large Short Nosed Dogs (155-220 lbs)