I took a chance on ordering 2 of these because there were no specifics on sizing. I ordered a medium and a large. I was pleasantly surprised that the large fits my mini horse with a bit of room. I actually bought it for my mini donk but it was too big. The medium nicely fit my 33" mini donk with room to spare. It is nice to find a nicely priced cute halter that adjusts for the mini's. I will order a few more for the other donks since I know the sizing.