Comment by dripton

Minor spoilers. (I've ascended but that was a long time ago so some of my NetHack knowledge might be outdated.)

You can mostly trust your pet. But you can't totally trust your pet, because there are some foods that are good for pets but not for @.

One is tripe. I don't get tripe in my pho because NetHack told me it's dog food.

Another is whatever species you are. If you're a human and eat human, or an elf and eat elf, you might get smitten for cannibalism. It's fine for your dog or cat to eat human or elf though.

And there's also the edge case of almost-spoiled food. If your pet eats one of a group of corpses on turn n, and you eat another on turn n+1, it's possible that yours rotted in the meantime. Either because n was the exact limit, or because it was close and yours died a few turns before theirs.