YANBU. I have a dog - I always pick up after her.
There are so many dirty, lazy people round here who are tough enough to march around with a staffie on a chain, but who are too embarrassed/think they're above picking up their dog crap.
There's someone who lived down the road that my ds's nursery is on. Every day they walk the dog outside the nursery early in the morning and let it crap outside the gate where all the children go in. Every day the children tread in it on their way in. Every day.
I'm going to make a poster saying:
"To the person who leaves their dog mess on this pavement every day
Yes, YOU, you know who you are
Children in this nursery tread in your dog's mess every day and walk it into the school.
Stop exposing our children to disease.
CLEAN UP YOUR MESS!
The nursery said they'd laminate it for me and then I'm going to attach it to the fence.
Even if it doesn't work, at least it'll make me feel I've tried to do something.