Not sure which size?

Between sizes or at the top of a range? Size up. Top-of-range is the worst-fitting spot for any life vest.

SizeWeightChest girthBack length
XS0–6 lb13.0–17.7 in7.9 in
S6–13 lb16.9–21.7 in9.8 in
M13–24 lb22.8–27.6 in12.2 in
L24–55 lb26.4–32.7 in15.7 in
XL55–88 lb29.5–43.3 in19.7 in
Reference dog per size
Size XS reference: like a 4 lb chihuahua
XS
like a 4 lb chihuahua
Size S reference: like a 10 lb toy poodle
S
like a 10 lb toy poodle
Size M reference: like a 20 lb Frenchie
M
like a 20 lb Frenchie
Size L reference: like a 40 lb border collie
L
like a 40 lb border collie
Size XL reference: like a 70 lb golden
XL
like a 70 lb golden
See product detailsSizing FAQ