For best fit, measure your pet’s back length.

Size:
XXS: Back 7-8 in; Chest Girth 11-12 in; Neck 4-6 in
XS: Back 8-9 in; Chest Girth 12-14 in; Neck 5-7 in
S: Back: 9-11 in; Chest Girth 15-17 in; Neck 7-9 in
LG: Back 15-18 in; Chest Girth 21-25 in; Neck 13-15 in

Caution:  This item is intended to be used for a short duration, under close supervision. Sizing should allow room for 2 fingers to fit between the item and the neck. To avoid risk of ingestion or entanglement, supervise pet when using this item. Not for use during containment. Do not use as a restraint.