My 24 day old colt has a bubble butt all on his own. He just runs and plays all day long.Long trotting....that will give nice smooth muscling in the hindquarters.
I know someone who used to 'condition' her horses by backing them up...a lot--without exception all the backing up gave her horse big bubble butts. I guess some people like that sort of a back end, but I don't--and not all Mini judges do either. IMO long trotting gives a much nicer result.
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