The harness strap comes in two widths:
5/8” for smaller dogs under 40 lbs – Dachshunds, Italian Greyhounds, Whippets, Jack Russel Terriers, Beagles, Miniature Schnauzers, etc.
1” for larger dogs over 40 lbs – Boxers, Labrador Retrievers, Golden Retrievers, Greyhounds, German Shepherds, Basset Hounds, Pit Bulls, Great Danes, etc.
To measure your dog for the harness, use a soft measuring tape (or a piece of string) and measure all the way around the largest part of your dog’s chest. Choose the SMALLEST size that fits within that measurement.