system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do dogs die when they eat chocolate?
gpt
Chocolate contains a chemical in it called "theobromine." This chemical is also toxic to humans and has many of the same effects as caffeine, but we require a much larger amount to start to feel the effects due to (1) our size, and (2) we are able to process theobromine into something harmless faster.