We know now that donkeys and horses react differently to drugs. The way a donkey's metabolism works is not the same as that of a horse. Donkeys metabolize a drug faster, which is surprising considering they are not usually as big as a horse. Donkeys come in three broad size ranges, Matthews explains. The smallest is miniature, standard is medium sized and the largest are called mammoths, which are about the same size as a horse.
Donkeys also come in a variety of colors, including black, white, brown, grey and even pink.
They can also be multi-colored. In fact, they are very intelligent creatures who don't scare as easily as horses. When threatened, they tend to freeze, which is probably how they got the reputation of being stubborn. Donkeys live longer than horses, too. Dogs and donkeys don't get along at all.