I have a similar problem on some 27 acres of land I own down the road a bit, its sort of a nature reserve (I like that kind of thing) and I dont mind peeps walking their dogs on it as long as they clear up. What I do object to is asking them to clear up and being told to p*ss off or when I fence bits off them pulling down the fence to walk there "because they have always walked there" they dont seem to understand the meaning of private property, and often argue with me that its common land not private! I have even been told that they will only clear up when I provide dog bins!!!! this is basically private agricultural land, how do you get through to thickos like that? Mind you the flasher I caught over there last October didnt hang about, if you'll pardon the pun!