What to do about a neighbor's dog's poo in my yard?

I searched but didn’t think this was covered – sorry if I missed it.
So my neighbor consistently lets his massive dog take massive dumps in my front yard. I am not a huge fan of dogs in general or this neighbor (who happens to be an alderman) but I guess that’s not exactly relevant. I have already given him a little bone thing with poo bags in it as a subtle hint to clean it up. Also, not so subtly I placed a ‘this is not your dog’s toilet sign’ in my yard. Now I think he just does it because he’s an ass. Any suggestions on what I could do because I’d like to cut my grass without ruining another pair of shoes. I know this is petty I’d just love to hear some suggestions since my sign was probably a misstep.