system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why is it that dogs can eat their own feces and seem ok but when humans ingest feces (hopefully by accident) it gets us terribly sick?

I understand E-Coli  is what makes us sick but do our pets have a natural immunity towards it?
gpt
Humans developed a revulsion to the smell of feces to help us stay clear of it to avoid getting sick. Dogs developed a tolerance to the bacteria in feces. Two solutions to the same problem.

Aren't you glad wasn't the other way around?