If it is really bothering me I would offer to help them clean it up. Another thing you could do is try to talk to them about it in a nice way of course.
Ask them nicely "please clean up your yard".
This is an annoying habit some dog owners allow and it is against the law at least in British Columbia to allow your dog to roam around the neighborhood. It would be best to get in touch with your neighbor and calmly ask them if they could keep their dog in their yard and if there is no yard then ask them to kindly clean up their dog's mess from your yard. Wait and see what the neighbor does and if you don't get any satisfaction from them then call the ASPCA and report it.
If it fell in your yard then you can keep it.
Many cities have regulations that deal with the mowing and upkeep of a citizen's yard. Contact city officials to have them deal with the problem. In most cities and towns, a citizen may be fined for not mowing a yard, and in some cases the city will clean up the yard and charge it to the citizen.
rough side toward your yard, if you built it.
Either give it to your neighbor or, at least, ask him if he is missing a knife.
She was mad at her neighbor for blasting loud music into the night
It depends on how your neighbor's yard and your own looks like. Perhaps a rectangular fence would be suitable.
no, you can spy on a neighbor as long as you do not get in their yard or threaten them.
Be Quick - pick up pine-cones in your yard or a neighbor's that has A LOT of them, clean windows in the house, stock cans at a Food Bank. Be quick,painful and humbling
A neighbor's prank? Some form of intoxication? Hallucination? Actually, if it is in your yard it is not flying and is therefore not a uFo.
throughing something on their yard