First things first. Make sure you know your dog's measurements.
GIRTH - Measure around the widest part of the dog's chest.
LENGTH - Measure from the collar to the base of the tail.
If your measurements don't line up perfectly with one size or have a growing dog, don't worry. Select the size that accommodates your largest measurement. You can always add a Booster Block to make up for lack of length.
Need some extra help? Check out the Sizing Guide video below!