It is advisable to first attempt to talk to the neighbor nicely, and if they refuse to do something about it, I would threaten to get the police involved. You also may want to consider a fence that wont allow a dog to get in. I hate that you are having this problem.. I too had a problem wtih a neighbors dog... Her female dog kept coming thru my fence and fighting with my dog. I have talked to the neighbor several times... and they wouldnt stop it, so I ended up adding thin wires to the spaces of my fence to keep the dog out. Good luck to you.
Just wondering how the neighbor’s dog can pee on your lawn. Your area is not fenced up? If you live in an open area then it is a little tricky. You could certainly talk to your neighbor about it. You could purchase those “leave my lawn alone” kind of stuff. It consists of small pellets, which release an unpleasant smell (to dogs and cats); hence, they might stay away from this lawn area. However, don’t be surprised when the dog is selecting another area to substitute for the “lost” toilet area. If you can’t fence up your area, then you might face an uphill battle.