Is it true that a dog has a clean mouth? - briefly
It is a common misconception that dogs have clean mouths. In reality, dogs' mouths can harbor numerous types of bacteria, including those that can cause illness in humans.
Is it true that a dog has a clean mouth? - in detail
The notion that dogs have clean mouths is a common misconception often perpetuated by popular culture. This myth likely stems from the observation that dogs frequently lick their wounds and those of others, which can sometimes lead to improved healing. However, this does not mean that a dog's mouth is cleaner than a human's.
Dogs explore their environment with their mouths, picking up bacteria and microbes from various surfaces including the ground, garbage cans, and even feces. Their saliva contains a multitude of microorganisms, many of which are harmless to dogs but can be potentially harmful to humans. Some common bacteria found in dog saliva include Pasteurella, Capnocytophaga, and Staphylococcus.
Pasteurella is particularly notable as it is responsible for the distinctive "dog bite" infection. Capnocytophaga can cause more severe issues such as bloodstream infections or meningitis in individuals with weakened immune systems. Additionally, dogs can carry parasites like hookworms and roundworms, which can be transmitted through their saliva.
While it is true that dog saliva contains compounds that have antimicrobial properties, these are not sufficient to completely sterilize the mouth or prevent the transmission of harmful pathogens. Moreover, the idea that dogs' mouths are cleaner due to self-grooming is also misguided. While grooming does help maintain oral hygiene, it does not eliminate all bacteria and microbes.
In conclusion, the belief that a dog has a clean mouth is a myth. Dogs' mouths contain numerous bacteria and microorganisms that can potentially cause illness in humans. It is essential to take precautions when interacting with dogs, especially for individuals with compromised immune systems or those at higher risk of infection.