1. Head circumference
Measure your head circumferencewhere you expect the glasses to land
on the forehead - usually an inch or so behind the eyes.

2. Circumference of the snout
Measure your dog's girththe muzzle where you expect the glasses to land
on the nose - usually around the back of the mouth.
Head circumference |
Circumference of the snout |
Goggle Size |
Less than 26.67cm |
Less than 15.24cm |
Extra Small (XS) |
26.67 - 30.48cm |
15.24 - 20.32cm |
Small (S) |
30.48 - 35.56cm |
20.32 - 22.86cm |
Medium (M) |
35.56 - 44.45cm |
22.86 - 29.21cm |
Large (L) |
44.45cm + |
29.21cm + |
Extra Large (XL) |
30.48 - 38.1cm |
15.24 – 22.86cm |
*Small-Wide (SW) |