Thus is the early stage of laminitis and founder will come, if not treated.
Like others said, soft ground, a mudhole to stand in, and since he us quite rotund, I'd scratch any grain and the alfalfa and give soaked grass hay until a vet gets there. Alfalfa is lower in sugars than most grasshays, but is not safe when you deal with an already overweight horse, as it provides too many calories.
To soak the hay, put his portion in a tub or wheelbarrow and soak it for one hour, discard the water and feed.
Don't starve the pony please.
Laminitis is an emergency, even if only suspected.
Und try to get a hold of the owner for the okay to call a vet out immediately.
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