August 11, 2011- You might want to think twice the next time you let your dog give you a big, slobbery kiss! Scientists at the University of Guelph in Ontario, Canada have new evidence that dog's mouths are not as clean as we thought! Scott Weese at the University of Guelph's Ontario Veterinary College used a new DNA sequencing machine to analyze samples of saliva from dogs. He and his team found more than 100 species of microbes in the dog saliva, which is similar to the amount found in a human mouth! The DNA sequencing machine can tell the researchers exactly what species or type of bacteria are present. Microbes are a type of microscopic bacteria or germ that are found in humans and animals.