Disturbingly, this kinda breeding for bad traits exists in horses, too.
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These horse have double muscling. This also leads to them having seizures a LOT. They're useless animals referred to as "halter bred". Can't ride it, or work with it. They're marked as HYPP N/H for this trait, it's legit something bred into the line.
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The opposite of those horrible looking arabians. It's like a goat.
I could compile a bunch of hell horses, if anyone wants.