The get the proper fitting for your puppurs sizing, click here
 
XXSMALL Chest Circumference 13.5"-16"   (NO UPPER HANDLE)
XSMALL Chest Circumference  15.5"-19"    (NO UPPER HANDLE)
SMALL Chest Circumference  17"-23"         (NO UPPER HANDLE)
MEDIUM Chest Circumference 24" - 31"   (WITH UPPER HANDLE)
LARGE Chest Circumference 31" - 40"      (WITH UPPER HANDLE)
 
Our FLUID harness is design to sit 3-4 finger widths behind the elbow and then around the rib cage on medium and large dogs, on small dogs, it should be adjusted to be 2-3 finger widths behind their elbow.