You know that woman's intuition thing? That feeling we get in a visually good situation that feels just wrong.
I am guessing this is something similar. Probably just being very overprotective of his baby, which is perfectly reasonable, and he very well might have a "bad feeling" over the pony, the owner, or just something off about the situation. I'd talk it over with him to figure out what exactly is wrong, and then keep going.
Some more ammo for you, ponies generally are more hardy and live longer than horses, so you could have(with proper care) ten good using years out of a twenty year old pony, just for an example. ;)
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