Sometimes you might find that your dog is in-between sizes.
For example, if your dog has a 19" girth, they could fit into either a Small harness (adjustable from 15"-20") or a Medium harness (adjustable from 18"-25").
If your dog is in-between sizes and under 12-months, is a breed that develops a thick winter coat or if you'd like to place the harness outside your pup's jacket during the winter, we recommend sizing-up to ensure that there is enough room for further adjustments.
If you find that your dog's weight or coat does not fluctuate significantly throughout the year or your dog doesn't wear a winter jacket, then opting for a fit that is spot-on may also be an option.
When in doubt, we recommend selecting the larger of the two sizes they fit in.