[quote=@Guilty Spark]
[quote=@Fillet]
His giant isn't so much tall like traditional giants as wide like a bodybuilder, I think is what he's saying. And if his char is extremely heavy from the muscles, he might be right about the horses, unless they're special huge giant horses - [url=http://www.horsesciencenews.com/horseback-riding/how-much-weight-can-a-horse-carry.php[/url]545kg horse to carry comfortably 109kg of weight.[/url] There's another article citing a Japanese research team that said a max of about 29% of horse's weight for their breed tested. So if his char weighs more than 200kg which seems quite likely, then our usual standards of horses won't be able to carry him and move easily.
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If these giants have been around for a while and horses are part of their culture to any extent, it would not be beyond imagination that their breeds of horse have developed to be larger in size/musculature to better cope with the weight of their bearers (something humans did). 

Plus, that source is dealing with horses of a different size. A warhorse could weigh up to 2,200 lbs (whereas those were nearly half of that), and during jousting tournaments they would carry an average of 160 extra lbs between their armor and the armor of their riders, not to mention the weight of their riders which could exceed 200 lbs for a healthily muscled warrior.
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So then we're in agreement.