I just have one mini jenny. I bought her for my husband, as he likes to hear a donkey 'talk'. But, she has never really has found her 'voice', she just has a squeaky sounding hee-haw. My husband named her Donna Key. She is spotted, but mostly white. Some of her spots are gray and some of them are black. I think she is about 32" tall, but I've never measured her. I have 30 mini, and the jenny stays out with them. She has been pastured with all of my stallions, but so far, no little hinnies.
I do have one other donkey, but he's not a mini. I bought a donkey gelding as a guard animal when we got a forty acre pasture that had some wooded areas. I was a little afraid about turning minis out in a field so big that I couldn't see them all the time. I bought him at a livestock sale, and he was supposed to be two. But, I think now that he was only a baby. I've had him for over a year and a half, and he still only has one set of permanent teeth. He has also grown a LOT. He was slightly bigger than than an 'average' donkey when I got him, but now he is pretty big. I would guess getting close to 14 hands tall. He is certainly big enough to be a guard animal to run off coyotes and stray dogs, but he is afraid of the minis, and lets them boss him around. My husband named him Don Key....