For small dogs add approximately 1/2 inch to the dogs exact circumference of his snout.
For medium dogs add approximately 1inch to 1-1/2 inch to the dogs exact circumference of his snout.
For big and large dogs add approximately 1-1/2 inch to 2 inch to the dogs exact circumference of his snout
| Wire Muzzle | Wire Muzzle Sizing | Inches (cm) | Inches(cm) |
| Muzzle # | Breeds | Length | Circumference |
| 0 | Very small breeds like Yorkshire Terrier,
Miniature Pinscher, Ratter,
Miniature Schnauzer etc. | 2 inch (5 cm) | 7 inch (18 cm) |
| 1 | 2-1/3 inch (6 cm) | 8 inch (20 cm) |
| 2 | 2-3/4 inch (7 cm) | 8-1/2 inch (22 cm) |
| 3 | 3 inch (7.5 cm) | 10 inch (25.5 cm) |
| 4 | Middle size breeds like Poodle,
Spaniel, Schnauzer,
Foxterrier, Pinscher,
Weimaraner etc. | 3-1/3 inch (8.5 cm) | 10-1/2 inch (27 cm) |
| 5 | 3-3/4 inch (9.5 cm) | 11 inch (28 cm) |
| 6 | Bigger dogs like German Shepherd,
Pointer, Dalmatian, Setter,
Labrador, Golden Retriever,
Poodle (big), Siberian Husky,
Alaskan Malamute etc. | 4 inch (10 cm) | 12-1/2 inch (32 cm) |
| 7 | 4-1/3 inch (11 cm) | 13-1/3 inch (34 cm) |
| 8 | 4-1/3 inch (11 cm) | 13-2/3 inch (35 cm) |
| 9 | 4-2/3 inch (12 cm) | 14-1/3 inch (36.5 cm) |
| 10 | 5 inch (13 cm) | 15-1/3 inch (39 cm) |
| 11 | German Shepherd (big),
other bigger Shepherds, Newfoundland,
other very big dogs | 5-1/2 inch (14 cm) | 17-1/3 inch (44 cm) |
| 12 | Saint Bernard ,
dogs with extra broad snout | 5 inch (13 cm) | 18 inch (46 cm) |
| 13 | Great Dane, dogs with extra big snout | 5-1/2 inch (14 cm) | 17-2/3 inch (45 cm) |
| J1 | Dachshund and other small dogs
with longer snout | 2-3/4 inch (7 cm) | 8 inch (20 cm) |
| J2 | 3 inch (8 cm) | 8-1/3 inch (21 cm) |
| J3 | 3-1/2 inch (9 cm) | 9 inch (23 cm) |
| D1 | Doberman Pinscher, Collie,
Setter, Pointer and other dogs
with longer snout | 4-1/3 inch (11 cm) | 11-1/2 inch (29 cm) |
| D2 | 4-1/2 inch (11.5 cm) | 12 inch (30.5 cm) |
| D3 | 4-2/3 inch (12 cm) | 12-1/2 inch (32 cm) |
| B1 | Boxer and other dogs with short snout | 2 inch (5 cm) | 12 inch (31 cm) |
| B2 | 2-1/3 inch (6 cm) | 13-2/3 inch (35 cm) |
| B3 | 2-3/4 inch (7 cm) | 15 inch (38 cm) |
| R1 | Rottweiler, Golden Retriever,
Labrador, Mastiff, Great Dane,
dogs with broad snout | 3-3/4 inch (9.5 cm) | 13-2/3 inch (35 cm) |
| R2 | 4 inch (10 cm) | 14-1/2 inch (37 cm) |
| R3 | 4 inch (10.5 cm) | 15-1/3 inch (39 cm) |
| Sz1 | Big Schnauzer,
Old English Schepdog,
Bouvier des Flandres | 4 inch (10 cm) | 13-2/3 inch (35 cm) |
| Sz2 | 4-1/3 inch (11 cm) | 15 inch (38 cm) |
