We are testing to see if dog saliva prohibits the growth of skin bacteria compared to human saliva and penicillin. To see which substance prohibits the growth of bacteria the most we placed each substance into a petri dish containing Staph. Epidermis and E. Coli. Going by research done previous to the experiment, we hypothesized that dog saliva will prohibit the growth of bacteria greater than human saliva and less then penicillin. According to other research, we predict that with dog saliva, it will prohibit the growth of the bacteria, but at the same time there will be a bacteria found in the saliva that will begin to grow around the saliva.