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edit on 11-3-2014 by Sublimecraft because: (no reason given)
Q. Is it true there are more germs in the human mouth than around a dog's anus? –R. T. Tin
A. The usual comparison is between the human mouth and dog's mouth, not the dog's other end, says Dr. Joseph Zambon of the University of Buffalo School of Dental Medicine.
Some 200-300 different bacterial species may hang out in the human oral cavity, plus viruses and other microorganisms. Certainly, people with diseased gums have more bacteria and more types of bacteria than dogs with healthy mouths.
"But you can make the other, more colorful comparison as well. There are higher concentrations of bacteria in human dental plaque than in a dog's feces." So you might extend this to include the dog's alimentary exit point as well.