Length measurements: Make sure your dog is standing squarely (looking straight ahead). Measure along the length of their spine from just below their collar to where their tail is about to start. (Basically, you need the length of their back.) We’d suggest you choose one size up if your dog is on the chunky side or has a deep chest. (Measure A) Girth/Chest measurements: Measure right around the body from just behind the front legs. (Measure B)
Collar/Neck measurements: Measure your dogs neck to get an accurate collar size. Remember to add extra to allow a comfortable fit on your doggie. You should be able to put two fingers between the collar and your dogs neck. (Measure C)