Want To Fight Allergies? Get a Dirty Dog
sciencehabit writes "A dog in the house is more than just good company. There's increasing evidence that exposure to dogs and livestock early in life can lessen the chances of infants later developing allergies and asthma. Now, researchers have traced this beneficial health effect to a microbe living in the gut. Their study, in mice, suggests that supplementing an infant's diet with the right mix of bacteria might help prevent allergies — even without a pet pooch."
I must disagree with your rationale for wanting dogs banned in urban areas (because that's what I deduce from your wording that you want). There are already laws in place for dealing with those aspects that annoy you, respectively noise and littering.
The fact that there are inconsiderate people out there is not, in itself, sufficient to call for an outright ban.
I lived close to a bar, and I can tell you a thing or two about noise, street fights and vomit on the sidewalk. I still did not consider asking for a ban on all bars within urban areas. I did, however, call the police when i considered it appropriate.