Extra Small Harness

Neck : 17.25" - 18.75"

Chest : 18" - 19.75"

Small Harness

Neck : 18.5" - 21"

Chest : 21.75" - 24"

Medium Harness

Neck : 20" - 22.25"

Chest : 23.25" - 26.5"

Large Harness

Neck : 22" - 26"

Chest : 26.25" - 29.5"

extra large harness

Neck : 24.75" - 30"

Chest : 28" - 35"