My son lives in an apartment complex that allows dogs but residents must pick up their dog's POO. Some do, but there are the thoughtless ones who do not.  So, my son, getting tired of coming home with poop on his shoes wrote the verse below, underneath the dog walking sign...

I revised it a wee bit...

We love our dogs, they are our friends,

But when poop drops from their rear-ends.

It's stinky and smell and yucky  too!

It belongs in the trash, not on MY SHOE!