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Pellets will not swell up in horses either. All good horse forums will say this is a myth. Any problems seen are coincidental from a horse that doesn't chew properly or has muscle damage and would have gotten choke or colic from other food sources.
Right, but still a life threatening problem. Not chewing properly, eating to fast....just not fun to watch and immediate human help necessary. They do absorb plenty of fluids, so they may swell and cause further problems, more though than other good feed options. I have worked in a large animal hospital in Europe and have seen some very well cared horses up to Olympic level with problems....