Hi. I don't personally have a halter horse, but one of my friends at my trainer's barn does (or did). She bought a 7 year old halter horse that had qualified for the Quarter Horse worlds. He was a beautiful and kind horse. I say 'was' because he died a horrible death alittle over a year ago. She got to have him for 1 1/2 years before his death. After his death, they found alot of scaring in his organs. The vet said he must have been on steroids before my friend bought him. It broke my friend's heart. She now has a yearling filly that my trainer had. She knows this baby will never have steroids.