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Dog Collar and Harness Size Guide

Measure your dog for collars, harnesses, and pet apparel with Petcous fit tips for neck, chest, and back length.

How to measure

  • Neck: measure where the collar naturally sits and leave room for two fingers.
  • Chest: measure around the widest part of the rib cage behind the front legs.
  • Back length: measure from the base of the neck to the start of the tail when choosing raincoats or apparel.

Fit tips

If your dog is between sizes, choose the larger size and adjust for comfort. Check fit again after your dog walks, sits, and turns. Remove any accessory if it rubs, restricts movement, or causes discomfort.

Shop related Petcous collections: dog gear, pet apparel and accessories, and all pet accessories.