1. Measure the Length
Measure your pet from base of the neck to base of the tail.
2. Measure the Girth
Measure your pet's chest at its widest point, which is usually behind the front legs.
3. Measure the Neck
For pet's with larger than normal necks, measure your pet's neck circumference as you would a collar.
If measurements fall between sizes, or if your pet has a stouter build, it is recommended to select one size larger.