Me and my brother grew up with dogs (my parents had two German Shepherds) so we always came in contact with dog saliva. But we came in contact with all sorts of dirt. Pretty normal when you grew up in the countryside. I'm rather sure that those things
helped us building up a strong immune system. People tend to be overcautious nowadays. Maybe that's the reason why there are so many autoimmune diseases these days.
Medical professionals have suggested that the hygiene hypothesis explains the global increase of allergic and autoimmune diseases in urban settings. However, neither biologic support nor a mechanistic basis for the hypothesis has been directly demonstrated. Until now.
www.sciencedaily.com
Humans are not that sensitive - our civilization is still here after all those epidemics, pandemics ... and wet doggy kisses.
I remember that regarding our vet eating poop could be a sign of nutritional deficiency.