Bests & Worsts Reviews from Amazon

It does not mention sizes in the description. So I guessed on a size. I ordered smalls which luckily fit my two shelties. Their neck sizes are 11" and 13". The size chart it came with says: petite (5"-8") small (8"-12") medium (10"-16") large (14"-20"). I'm just glad I ordered a small. Mediums would have been way too big. So when ordering order a size smaller than what the chart says. Hope that helps. :)