A new study published in the journal Archives of Oral Biology says that dogs and their owners had a higher rate of "periodontopathic bacteria" in their mouths.
Periodontopathic bacteria can make humans and dogs more likely to get diseases in the mouth and around the teeth, reports Wtop.com.
Japanese researchers examined dental plaque from 66 dogs and 81 people in 2011, and found periodontopathic bacteria in more than 70 percent of the dogs and 16-30 percent of the humans.
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Researchers wrote that germs went from owner to dog as well as dog to owner: "These results suggest that several periodontopathic species could be transmitted between humans and their companion dogs, though the distribution of periodontopathic species in both is generally different."