Pet waste is basically raw sewage. Dog poop contains harmful organisms like Roundworms, Giardia, and E. coli which can be transmitted directly to humans. These organisms can remain on your lawn for as long as four years threatening the safety of your pets and children. The only way to remove the danger is to pick up your pet waste and place it in the trash.
And if that's not enough of an incentive, you could also earn yourself a $250 fine for leaving pet waste on public or private property (BMC 6.16.011).
Learn more about picking up after your pet.