i had the same situation a few years ago, lived in an apartment but it was like the whole house, with a yard, the neibour some 60 or so year old lady let her two dogs come onto my lawn and shit. i went and knocked on her door and she didnt answer so i left a note saying something like stop letting your mutts shit on my lawn bitch! well come home next day, and theres more shit....so i went inside, got my pipe and some bud went to my truck, sat in there puffin some weed waiting for her to bring those dogs out. a good 2 hours goes by and she does, i get out, walk up to her, say listen if you or your dogs ever step on my lawn again i will shoot your fucking dogs, i showed her my hi-point .45 cal and went inside. never came on my lawn again