Aria the Fox™ Waterproof Collar Size Chart

Aria the Fox™ Waterproof Collar
How to Measure
Use a soft tape to measure the lower part of your dog's neck (above the shoulders).
Alternatively, you can measure your dog's current collar, just make sure you know what section to measure. 
Click link to see a YouTube video showing how to measure: 
https://www.youtube.com/watch?v=uwYpxjpvnHQ
SIZE  NECK SIZE COLLAR WIDTH
XS 11 - 13 in 1 in
S 13 - 15 in 1 in
M 15 - 17 in 1.25 in
L 17 - 20 in 1.25 in
L/XL 19 - 21 in  1.25 in
XL 20 - 28 in 1.25 in