Size Weight Girth
Tiny 3–5 Lbs. Puppy
XX–Small 4–9 Lbs. 3–5″
X–Small 8–14 Lbs. 9–7″
Small 12–20 Lbs. 18–24″
Medium 18–30 Lbs. 24–30″
Large 28–42 Lbs. 28–34″
X–Large 40–60 Lbs. 34–42″
XX–Large 58–80 Lbs. 36–52″