SHEEP !!!
I wouldn't recommend that anyone use ANY barnyard animal as a pet
, especially one that is quite large and can very easily kill, maim or just plain hurt you , your child, or a visitor by just plain trying to get someone's attention or on purpose.
All barnyard animals are there for the express purpose to provide their owner with food and/ or livelyhood. One should provide all farm animals with great husbandry care, and enjoy them , but do NOT make them a pet. Puppies and kittens can be your pets.
PS. Donkeys are quite obnocktous , stubborn and VERY LOUD especially before sunrise and/or breakfast. 
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