The Black horse is a 30 inch stud pony the white mare is 34 inches. I have a 37 inch that also uses this same halter. Now I can adjust these if you want it smaller or a tad larger. We make these so we are able to adjust it at will. If you have any issue we are happy to work with you any way we can. All I ask is contact me first instead of Ebay. They are hindering communication and making it harder and harder for you you to work with us. Oh and we are sending a 6 Ft single ply leash with this and throwing in free shipping to boot. Thanks for shopping with carterpetsupply.