Muzzle Keeper Sizing Chart
| Size | Neck Circumference | Example Breeds |
| XXL | Size in inches: 18-19 | Borzoi |
| XL | Size in inches: 16-17 | Average male greyhound |
| L | Size in inches: 14-15 | Average female greyhound |
| M | Size in inches: 12-13 | |
| S | Size in inches: 10-11 | Average male Whippet |
| XS | Size in inches: 8-9 | |
| XXS | Size in inches: 6-7 | Large Italian Greyhound |