Total Weight
In most cases, your dog’s total weight will determine what size they need. Tip: If your dog’s weight is between sizes, we recommend sizing down.
Age/Condition
For older dogs that may be struggling with muscle wastage or degenerative hind legs, sizing down the harness rear may be needed to achieve an optimal fit. You can always get a smaller rear harness here.
Tip: Consider where your dog’s total weight falls within a size range. If your dog weighs at the lower end, a smaller rear harness might help - a 25kg dog with a degenerative hind may benefit from a small size rear, while a 34kg dog with similar build would do well with a full medium.
Breed
Occasionally, some barrel-chested breeds may require a larger harness front in order to achieve an optimal fit. If your barrel-chested dog’s total weight is between sizes, a larger front harness here - size up the front and size down the rear.