What can I sprinkle or put in my yard to keep other peoples pets from pooping in my yard

what can I put in my yard to keep people's pets that they let out from Pooping in my yard I don't want to hurt them or make them sick I just want to stop them from pooping in my yard i'm tried of cleaning up stinking poop that is other peoples pets Is there something that cats and dogs don't like the smell of that will not kill the grass?

Draw an chalk outline of a dog on the sidewalk, put a little pile of poop behind it and surround it with yellow crime scene tape. :-)

cooper wire cut into litte peices they hate the smell I think

try... atomic bombs :-)