we have all of ours in pipe fencing, big horses and mule, pony and small standard donkey, and mini donkeys, horses and mules... anywhere from 3-rail for the big ones and 4-rail through 7-rail for the minis... no reason for the higher number of rails other than we buy fencing used when we can get it reasonably priced and that's what we got...
as for personality, i agree, they are more like dogs as compared to the minis being like cats. when i go out it's my donkeys that call to me, it's my donkeys that come to the fence, the minis look to see if i have treats and if not they are not all that interested in my company LOL. same thing with entering the pen with a halter in hand, the minis run away and the donkeys are grabbing the halter and lead in their mouths as if to say "take me, take me".
i have not yet weaned a donkey foal, we are expecting our first two in March and April this spring, but intend on following the same weaning plan we used for our big horses and mini horses... so long as baby is not pulling mom way down, we like to wait till 6 months, by that time we have found they are not nursing all that much anyway, we will separate them from mom with one fence between for about a week so mom can allow nursing at her option, then we separate them far enough they can't reach. if baby is pulling mom down and extra rations don't help, we would look at weaning sooner, but so far keeping close watch we have been able to throw extra feed to mom and keep her weight stable.
welcome to the wonderful world of miniature donkeys! (actually any size as far as i have seen...) - when i first joined the forum i went back into the older threads and i learned a lot and got to know the others, and got to see a lot of neat pictures. just a thought...