Perhaps write out a letter explaining that unless the dog is kept restricted to the rightful owners property as not to let it stray, that it will become an Ex- dog , it will go to meet it's maker,it will be no more,it will pass on, it will become extinct, it will cease to be, it will expire,it will be a late dog,it will be a stiff , bereft of life,it will be pushing up daisies, it will run down the curtain and join the choir invisible ! and drop it into the owners mailbox ???..just a thought !!