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I.e. "Warnung vor dem Hunde"
Why is it not just "dem Hund" ?
Basicly it's a normal whom question, isn't it?
This -e is now archaic and almost not used except some set phrases (zu Hause, in diesem Sinne, im Jahre so-und-so) but this form was normal earlier.
You can read a little about it on English Wikipedia and much more on German - Dativ-e.
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