Hello! yes, I own donkeys. And sheep. 5 acres is plenty for a few donkeys. If you get some, either get all males(jacks) or all females(jennies). Because they will fight, seriously fight. If males, get them fixed or they will tear chunks off of each other every spring. Donkeys are like horses, they have to have a friend, another donkey or something. One will be lonely by itself. They are VERY smart and will do well to have a "job", like pulling a cart or carrying small loads around. Halters and blankets should be used often or they will balk at having them put on. Donkeys are very loving as a rule and will show it every day. They are excellent protectors of other livestock both large and small. Our chickens often ride around on their backs. They need a half a bale of good hay a day , each, in the winter. and a couple of cups of 14% sweet feed in a hanging bucket in the evening and plenty of clean water always available. Ours like molasses cookies as a treat. Your feed store has them. They need an area about 6x8 each as a stable. Or they can stable together in a 12 x 12 stall. What ever you do, you cannot suddenly change it later, so decide. if you try to separate them later it wont go well. They like to roll in fresh wood chips on the floor. They should have their stall cleaned of dung and urine daily and fresh wood chips or hay put down. They need a salt block that's for donkeys and horses, sheep take a different one. They need toys in the stall and on the pasture. We use traffic cones and the hard rubber balls with the handle molded on. They need a person to come twice a year to trim their hoofs. Be sure you have the space from your neighbors because they are very vocal and LOUD. They will bray when ever they see you in greeting. Get a good book all about donkeys and read it. Go to your local feed store and ask about them. They live 30 years or more so keep that in mind too.
The number one thing to know about donkeys is this; never, ever, turn your back on them. Always be aware of where they are when your in the pasture or stable with them. Donkeys have been known to kill their owners for absolutely no reason. Yes, really. They can be loving and fine one second and grab you with their powerful jaws the next second and throw you on the ground and stomp you and kick you to death. They just do. It could be anything including that you wore a different colored coat or shirt, you petted the other donkey first, who knows, they just are like that. Reports abound of owners who were the very best of owners with loving and docile donkeys that have been owned and handled daily for 10,15, 20 years that suddenly one day killed someone. They don't have to have a closed barn, they can be in a three walled open stable.
They are clever so make sure your gates are chained and latched securely or you will be chasing them. Mine have escaped three times in the last 6 years. If you sit in a chair or stool on the pasture they will come up slowly behind you and stretch their necks out over your shoulder and rest their heads on you. It means they love you. Have someone else around to watch out for you. Mine have never attacked or kicked me, but, one of them did bray repeatedly at me and rear up with front hoofs out, all wild eyed once. Still don't know why. I shouted it down and stood my ground. That donkey has been fine ever since. It was in the spring so was likely a hormone issue..