Since the moose around here easily clear the neighbors 7'+
fence that is around their entire 10 acres I don't see extra fencing to moose proof the horse enclosures justified in our budget.
The three that have been visiting this year did hop into my mini mules corral and managed to open the gate that closed off the extra stall where the alfalfa was stored.
They didn't eat much relative to their size, or really do much damage, and when they'd had enough, hopped out again.
Huck stayed out of their way and we could see his eyes peering out from behind his shelter in the flashlight beam.
I'm sure if they wanted to harass or injure Huck they could have easily, but they didn't, and I've never heard of, or witnessed aggressive behavior towards a horse from a moose. Not saying it hasn't or couldn't happen though.
Barking dogs they will kill without hesitation.
The alfalfa has been moved into a more moose proof area for now, so Huck can rest easy.
It's interesting to me that they never eat the timothy or grass hay that is stacked and tarped and easily accessible.
They just prefer the alfalfa.