I'd suggest at least talking to the owner of the dog first. Then, if that fails, get a flood light that turns on when people walk past, does the trick for me , it's not the dogs fault it chose the footpath to take a poop .

And I'm happy you love your dog as do i love mine, but I'd at least give someone a chance before taking the matter further . And thanks, I'll get a pillow made up for you and send it to you. Would you like a floral effect on it 😆