The chest girth should be the most important and decisive measurement to be considered
XXS: chest girth: 11-13in/28-33cm, dog weight<5lbs
XS: chest girth: 14-16in/35-40cm, dog weight: 5.1-8.5lbs
S: chest girth: 17-19in/43-50cm, dog weight: 8.6-15lbs
M: chest girth: 20-23in/53-58cm, dog weight: 15.1-22lbs
L: chest girth: 24-28in/60-70cm, dog weight: 22.1-44lbs
CAUTION: This is a floatation aid intended for use on a conscious dog in calm waters. Use rescue handle to life dogs in emergencies only. Do not leave dog unattended while using this product. Indented for dog use only.
eBasics Dog life jacket swimming vest swimsuit with Reflective strips Adjustable Belt life preserver buoyancy aid flotation suit for Dogs - B07BQZ3VRD