How to Measure your Dog.
Length = Measure the distance from the back of the neck to base of the tail.
Girth = Measure the distance around the rib cage. Start at the middle of the back. Go down the side, under the belly, and back up the other side to the starting point. Do not pull the tape tight or leave it too loose. This is the measurement for the velcro strap and should provide a comfortable, firm fit.