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X is an alkaloid found in chocolate, tea, cola beverages, acai berries and some other fruits. While these foods are safe for humans to consume, large doses of X can cause poisoning in smaller mammals, especially dogs and is called X or chocolate poisoning.
X in Latin also means ‘Food of the Gods‘.

Id X.

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Theobroma
It is the chemical which gives chocolate its distinct, bitter flavour. Plus given how it was considered a luxury in Central Americas, people considered it to be from the Gods. Though don't give it to your pets.
Watch a video on how the Aztec drank their chocolate.