Stop in for a cup of coffee

Yes and No. If he was expanding that should be OK. If changing, maybe not. ie bigger barn, more animals OK. But if you were basically growing crops and kept a handful of animals in a shed and now want a hundred head of whatever...that's a different use and needs to be considered. On the other hand if you move in to a house in the winter and it stinks next summer when the **** heats up - too bad.
it was an already existing operation. It's one of the oldest dairy operations in the state, well over 100 years old. Not very big, maybe 2-3 hundred head. They've been around that number for my entire life. They make a lot of specialty cheeses and such, family owned. Not a commercial operation. A neighborhood two miles away should have NO say. Especially when there is no waterway/creek for miles in any direction. and they're at a higher elevation so they can't claim runoff either.