If you have a dog at home, how often do you wash the water dish? Bad news--it's actually one of the most bacteria-infested spots in the entire house, even worse than the toilet. There's pathogens that include E.coli, MRSA and other harmful bacteria.

Here are the types of bowls that harvest bacteria the most to least. The stainless steel bowls are by far the best to have.

  1. Ceramic
  2. Plastic
  3. Steel

You should wash your dog's bowl once a day.  Aisling Carroll and Coralie Wright, two researchers  did a study on the types of bowls .

The most harmful pathogens, including E. coli and MRSA, exploded in ceramic bowls. The researchers were shocked. "Ceramic was a surprise in that we found the most harmful microorganisms present," Carroll says. "At the moment, we can't say for sure why this is, but it could be that ceramic enables bacteria to form structures called biofilms, which allow large numbers of bacteria to adhere and colonize surfaces as a group and protects them from certain elements that would normally kill/remove bacteria."