I have cute little miniature sized wood fences... Had, I guess you could say. We have ONE mini mare here who will not stop eating the wood. She has ruined two 4x4 posts to the run in (Salved that problem by covering them in metal) and she has ruined ten boards on the fence that have been re-placed - I'm sure she'll just eat the new ones as well.
She "beavers" right threw all of the wood. The other minis are starting now as well. They have three types of salt blocks, several toys and receive more than enough hay, she'll leave the hay for wood.
I've tried several spray on, paint on products like No Chew... didn't work.
Someone suggested used motor oil... didn't work.
When spring comes I will be making her a nice WIRE non edible fence however that's more than three months off and wood isn't cheap to fix!
Shoot the mini is fastly becoming the #1 option (Just kidding, Joke...)