Is Dog Saliva Unhygienic?

Which Bacteria Does Dog Saliva Actually Contain?

Dog saliva harbours over 600 different types of bacteria. The dominant strains are Pasteurella, Capnocytophaga and various species of Streptococcus. Contrary to popular belief, these bacteria are not automatically dangerous for humans; they belong to the normal oral flora of dogs.

Your dog needs this bacterial diversity. It protects against pathogenic germs and supports preliminary digestion. Additionally, dog saliva contains antimicrobial enzymes such as lysozyme and lactoferrin, the same substances that also fight bacteria in human saliva.

Why Don’t Dogs Get Cavities Without Brushing Their Teeth?

Dog saliva has a higher pH value than human saliva, between 8.5 and 9.0 instead of our 6.5 to 7.0. This alkaline environment prevents acid-producing bacteria from attacking tooth enamel. Therefore, dogs practically never develop cavities.

Tartar still forms, but for other reasons: The alkaline environment favours mineral deposits. This explains why your dog does not get cavities, but still develops yellowish-brown deposits on the teeth.

In Which Situations Does Dog Saliva Become Problematic?

Dog saliva poses risks if it enters your body or comes into contact with injured skin. The problematic bacteria are primarily Pasteurella multocida and Capnocytophaga canimorsus.

Specific risk situations:

• Open wounds or scratches on the skin
• Licking of mouth, nose or eyes
• Bite or scratch injuries
• Contact with a weakened immune system

People without a spleen have an increased risk of severe infections from Capnocytophaga. This type of bacteria can trigger sepsis in rare cases.

What Happens to Dog Saliva on Healthy Skin?

On intact skin, dog saliva remains on the surface. Your skin barrier effectively prevents bacteria from penetrating. After drying, most microorganisms die within a few hours.

The biggest problem is often not the saliva itself, but what the dog has eaten previously. A dog that has eaten faeces or drunk from stagnant water carries additional pathogens in its mouth.

Can Dog Saliva Trigger Allergies?

Dog saliva contains the allergen Can f 1, which also occurs in skin flakes. This protein triggers reactions in about 10% of people suffering from dog allergies, not only when inhaled, but also upon direct skin contact.

The reaction usually appears as local redness or itching at the spot where the dog licked. With severe allergies, it can lead to hives or breathing difficulties.

When Should You Avoid Saliva Contact?

Infants under 6 months should not have direct contact with dog saliva. Their immune system still reacts unpredictably to foreign bacterial strains.

People with immunodeficiency, diabetes or chronic wounds also belong to the risk group. Here, even a small amount of saliva can trigger serious infections.

Frequently Asked Questions About Dog Saliva

Is Dog Saliva Cleaner Than Human Saliva?

No, dog saliva is not cleaner. It actually contains more types of bacteria than human saliva. But most of these bacteria are harmless to humans as long as they do not enter the body.

Does Dog Saliva Help with Wound Healing?

Dog saliva contains antimicrobial substances, but these only help the dog itself. On human wounds, dog bacteria can cause infections rather than heal them.

Do I Need to Wash My Hands After Every Lick?

Washing hands is sensible if you will subsequently eat or touch your face. On the hand itself, dog saliva is harmless.

Can Dog Kisses Transmit Diseases?

Direct transmissions are rare, but possible. Pasteurellosis and Capnocytophaga infections have been documented, usually after bites or in cases of immunodeficiency.