Hee, hee, you’ve already discovered the difference “Unless she doesn’t feel like it.”
My standard donkey was 3 and had never had a halter on her when I got her BUT she was a partial bottle fed girl so right off the bat, People = Good things so I kept nurturing her curiosity.
I started by teaching her verbal commands in halter- walk, whoa & wait. Added turning etc. I had to teach her that a tap with a driving whip IS a signal, not me showing displeasure. Donkey’s have a VERY high flash point: think trying to start a fire with diesel fuel instead of gasoline. Look for the “glimmer/spark” and praise it with whatever works for that donkey be it a scratch behind the ears or a treat. However once your donkey is pulling a cart you are going love having that high flash point!
Mine took to the harness and ground driving & dragging dead weight easy peasey. Then I hitched her up and she was good to go. In the beginning I did basic driving and the past two years I’ve worked on her being correct, for a donkey, and our dressage test in CT/CDE reflect the improvement.
Donkeys do NOT do repetition. Period. They do “Donkey time”. Once they understand and execute the exercise you can practice it once or twice more in that session then move on to something else. You might be able to revisit it later during that session but the fastest way to shut down a donkey is to drill something over and over.
A donkey will remember everything, good and bad, so to the best of your ability do it right the first time. Case in point, one time years ago I was in the stall with my donkey and did not secure the stall door so she walked out. Grrr. However, not before that day BUT ever since that day, she always checks a stall door to see if it will push open.
A donkey is the safest creature to put to a cart in my highly biased opinion. We aren’t the fastest but we are the steadiest and easiest going pair you will see. Another example, at the marathon portion of the CDE I did last fall I knew I would never, ever make the time so it was just a matter of how far off the time I would be. I was 10 minutes beyond the maximum time and went right to the vet check. My donkey’s pulse and respiration were almost at resting rate coming right off a hilly and challenging course. Donkey time, they are going to take care of themselves, cover your ass if you will.
Go for it and have fun!