The Girth can be measured from the top middle of your dog's back all around the rib cage to where you started the measurement. That length is the Girth measurement.
The Chest measurement is typically 1/2 of the Girth. Some breeds, however, such as Bulldogs and Bull Terriers have larger chests. Other breeds or breed mixes may have smaller chests. The starting measument point is just above and slightly to the rear of where your dogs front leg attaches to the body. Measure all around the chest to the corresponding point on the other side of the dog's body. See the above pictures for reference. Check your dog's measurement against the range in the sizing chart.
The Easy Walk Harness comes in the following sizes:
PETITE dogs with girth measurement of 12 to 16 inches and chest measurement 5 to 5 1/2 inches. Strap width 3/8 inch.
PETITE/SMALL dogs with girth measurement of 13 to 16 inches and- chest measurement 6 to 7 1/2 inches. Strap width 1/2 inch.
SMALL dogs with girth measurement of 15 to 20 inches and- chest measurement 8 to 9 1/2 inches. Strap width 1/2 inch.
SMALL/MEDIUM girth measurement of 19 to 22 inches and- chest measurement 9 1/2 to 11 inches. Strap width 3/4 inch.
MEDIUM dogs with girth measurement of 21 to 28 inches and- chest measurement 10 1/2 to 12 1/2 inches. Strap width 3/4 inch.
MEDIUM/LARGE dogs with girth measurement 24 to 30 inches and chest measurement 12 1/2 to 15 inches. Strap width 1 inch.
LARGE dogs with girth measurement of 26 to 36 inches and chest measurement 14 to 17 inches. Strap width 1 inch.
EXTRA LARGE dogs with girth measurement of 32 to 46 inches and chest measurement 16 to 21 inches. Strap width 1 inch.