Being from Wisconsin as well, I do know that the manikin thing isn't illegal.

However, the garbage dumping, and deer corpse dumping most likely are. The garbage dumping most definately. We cannot just dump garbage all over the land in Wisconsin. The DNR has a page about waste handling.

Setup some trail cameras and catch your neighbor in the act. After being fined he will either correct his ways, or will end up in jail.

Sadly, we are dealing with new bad neighbors where my family has our hunting cabin. We had another bad neighbor that sold the land to the current people who are actually worse. The original owner ran a chainsaw all day long, every day of every gun deer season, for every year he owned his land.

He thought the deer were his pets, and he owned land in one of the best hunting areas where the land was all owned hunters aside from him. He should never have bought the land. A very bizarre guy to see the least. I never thought I would miss him.

Now the new owners are hunters, but who posted no trespassing signs and harass anyone who trails a deer onto their land. The rest of the owners don't allow people to hunt on their lands, but we all understand that deer run where they run, and we let each other track and retrieve deer shot as needed. We respect them enough not to gut the deer on their property, and they have done the same until the new people anyways. Typically we have only had to track the bucks shot in the archery season. When most of the land owners only have 40-80 acre plots it doesn't take much for a deer to cross property lines. The only exception is our west line that is next to county land.

The new people harass anyone who goes onto their land, but they expect to be allowed to go onto others land while retrieving their deer. A bit of courtesy would go a long way towards resolving the ugly issues between them and everyone else.

They also have made several permanent ATV trails for themselves in a region where ATV abuse has been such a problem they are banned from all public land. They also have been illegally riding down the fire lane on the west side of our property which has been posted for no ATV use. It's sad, but now we are discussing ways to catch them using the trail illegally so they get fined and possibly have their property seized. 17 years hunting from the same place and we have never had any major problems until a few years ago when the one family bought the land across the street from us.

All I can say is, don't do anything stupid. Gather data, and involve the authorities. Talking won't resolve the OPs problem any more than it will resolve my families issues. Just be careful and don't do anything that you will regret.

It's just hard and frustrating dealing with difficult neighbors.