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I once had to help an ass that had either been dumped or escaped and ended up at a park until the animal wrangling guy came. It was the sweetest creature I could ever imagine. All it wanted was to stand next to me and lightly push its head against my arm until I gave it pets and scratches. One of the best 30 minutes of my life.
Your original comment isn’t that far off, though. Donkeys are often kept with other animals because they can be ornery and mean as fuck, killing predators that come near where they’re being corralled. They’re known as the rural alarm system for a reason.