How can you gain muscle on a halter horse to get his butt and chest bigger? My horse is already huge I just want him bigger.

protein supplement & hill work
i would try lunging 5 min each direction over trotting poles 6 days a week! that helped a horse we didn't ride gain muscles❤️
I personally just say a horse is made a certain way, I don't think you can really change that. It sorta like saying I havr a lean jumper, buy I want her leaner.😂 I think just regular excersice and hill work will help!🙃
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