Trek Harness Size Chart
Choose your dog’s harness size primarily by measuring the widest part of the chest, directly behind the front legs. Weight can be used as a secondary reference.
| Size | Recommended Weight | Chest Girth |
|---|---|---|
| Small | 15–30 lb | 17–24 in |
| Medium | 25–55 lb | 22–31 in |
| Large | 40–75 lb | 26–35 in |
| Extra Large | 75–105 lb | 31–41 in |
How to Measure
Wrap a soft measuring tape around the widest part of your dog’s ribcage, directly behind the front legs.
Keep the tape flat and secure without pulling it tightly. If your dog falls between sizes, choose the larger size for a more comfortable and adjustable fit.