I don't want peoples cats or dogs crapping thier parasites in my yard where my children play, and that includes hookworms, roundworms, heartworms, pinworms and all kinds of other parasites, some very deadly to humans. And you foolish pet owners, don't think they don't get into humans, oh, they do, and only a fool would think they wouldn't.
CDC Reports Prevalence Of Worms Transmitted By Dogs And Cats To Humans Is Higher Than Previously Understood About 14 percent of the U.S. population is infected with Toxocara, or internal roundworms, contracted from dogs and cats. That's according to the results of a Centers for Disease Control and Prevention (CDC) study announced at the American Society of Tropical Medicine and Hygiene in Philadelphia.
More ....
http://www.medicalnewstoday.com/articles/87767.php
Also, another thing you won't hear mentioned much, Dog Heartworm is being transmitted to humans through misquito bytes now due to America's love affair with pets, heart failure in humans is now being commonly linked to this, the CDC knows this too, the data is out there, walk up dolts.
Do you let your pets sleep in your bed, ever seen your dog or cat drag its butt on your carpet and think it's cute? You have parasites, trust me, I know this to be true ...