HOW TO MEASURE FOR A SLIP MARTINGALE:
(A) Measure the widest part of your pup's head, usually behind the ears.
(B) Measure around the neck where your pup's collar naturally sits.
Select the collar size large enough to fit over the head, and adjust small enough
to fit comfortably around their neck.
We recommend measuring your pup's neck to ensure the perfect fit! This
can be accomplished using a soft tape measure or a piece of string and a ruler.