The donkey dealer in IN is Ty at Little Dude Ranch. He got us a very good jenny, and she helped break our 5 4-H calves when a very busy dad needed a little assistance. He probably knows people with donkeys in CO--Ty Sutherlin's Little Dude Ranch is on the Internet.
Our jenny is super gentle, but I'm still learning donkey behavior. Ours leads like a horse, which may not be common. What I should say, is that she leads like a horse, when she wants to go where she is being led. Donkey often has ideas of her own, and outsmarting her is a challenge. This one (we've had two) is great with the calves (not for sale) and is only as aggressive as necessary.
Some people put their donkey in their calving pasture to protect against predators, so we tried that. I thought it was going well until this week. A large, strong new calf was lying in the sun under an electric fence, one that borders a woven wire fence. The calf was breathing hard on a warm day, but it was still puzzling. I dragged the calf, which seemed listless, into the shade and out from under the fence.
Before I was out of the pasture a commotion got my attention. The donkey was standing over the calf (which had moved maybe 100') and was raising and lowering its front feet--I was too far away to see if it was hitting the calf. Next, I saw the donkey chase the calf on the run and donkey was biting the calf on the back. The calf was running for dear life. I immediately got the donkey out of the pasture. The calf may be blind in one eye, and jenny is a "person of interest." This week someone told me that they once thought they lost a new calf to a donkey. This was the 9th fall calf in the pasture, and the only roan. Why would a jenny with a sweet disposition attack a calf?