The following measurements are the dimensions of the actual product, not of the pet they fit. After measuring your pet, make sure all measurements fit within the following dimensions with a little room to spare.
| Neck: | Weight |
| X-Small | 7"-10" | 3 - 5 lbs. |
| Small | 10"-12" | 6 - 10 lbs. |
| Medium | 12"-14" | 11 - 15 lbs. |
| Large | 14"-19" | 16 - 32 lbs. |
| X-Large | 19"-23" | 33 - 45 lbs. |
| XX-Large | 23"-26" | 46 - 70 lbs. |
| XXX-Large | 26"-31" | 71 - 100 lbs. |
