04-01-2013, 05:24 PM
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I had a Mustang that shot up 2 inches when I started riding him the fall of his 5 year old year. It's not really common for a horse to continue to grow any significant amount that much later into life, but it does occasionally happen.
For what it's worth, horses will often continue to add muscle and bulk until they are well over 8 years old. My old retiree, Denny, got bulkier every year until he was 10. That can give the appearance of added height.
Heck, I just went through that this spring. I walked out into the big pasture to check the horses and I swore that my coming 4 year old had grown another inch or two from the last time I thought about it. Come to find out, he hadn't grown in height (still sticked at 16.1, just like a few months ago), but he had put on about 100 pounds of bulk (he's half draft and very stocky-built), so that made him feel taller/bigger even though he wasn't.