Our sizing is by dog's actual neck sizes. This size can be obtained by taking a comfortable measurement of your dog's neck with a measuring tape. Do not add 2 inches, as some sites suggest. If your dog's neck is 16 inches and they are full-grown, a Medium (13-20 inches) would be the best fit, not a Large (16-25 inches).
You can also measure your dog's current collar, lying flat from buckle to buckle. Please note this is a different measurement than the neck size. If your dog's collar length is 18 inches buckle to buckle (actual neck size 16" or so), they would also need a Medium (13-20 inches), not a Large (16-25 inches).
Custom size ranges are available, if your dog is on the beginning or end of one of our standard ranges. For example, if your dog has a 14 inch neck, we can do 11-16 inches or 12-18 inches. Please note we cannot add any more inches to our standard sizes (for example, 10-19 inches).
If you have any questions on sizing, we are here to help! Just contact us here