Don’t want my neighbors dog pooping on my grass

Is it wrong for me not to want my neighbor’s dog to crap in on my lawn? She also has grass so I’m just annoyed that she feels the need to have her dog go on my grass. I already told her husband since he was the one walking the dog and now she’s the walking it, and now she’s letting him use it on my grass. What is a nice way of telling them to stop? (Yes they clean it but out of respect for my wishes they should understand I don’t want their dog pissing all on my grass since it’s starting to have spots and turn yellow)