DFD Standard
| Size Guide | Weight (lbs) | Girth Inches | Length Inches |
| XS | 15 - 25lbs | 19 - 32" | 10 - 13" |
| S | 20 - 45lbs | 21 - 35" | 13 - 16" |
| M | 40 - 60lbs | 25 - 39" | 15 - 20" |
| L | 60 - 90lbs | 27 - 44" | 17 - 24" |
| XL | 90+lbs | 30 - 48" | 20 - 26" |
| Size Guide | Weight (lbs) | Girth Inches | Length Inches |
| XS | 15 - 25lbs | 19 - 32" | 10 - 13" |
| S | 20 - 45lbs | 21 - 35" | 13 - 16" |
| M | 40 - 60lbs | 25 - 39" | 15 - 20" |
| L | 60 - 90lbs | 27 - 44" | 17 - 24" |
| XL | 90+lbs | 30 - 48" | 20 - 26" |