Related Clues:

• Onager, for one
• Silly sort
• Silly fool
• Sure-footed domesticated mammal
• Foolish sort
• Farm animal
• Biblical beast
• Balaam's ride
• Bozo
• Item listed in "Thou shalt not covet . . ."
• Lazy animal?
• Express transportation?
• Obstinate equine
• One with a burden
• Farm beast