The Eberhard Faber “Woof Woof” was issued in 1923, something that The American Stationer and Office Manager saw fit to note:
There was even some poetry written by an ‘admirer’ of the Woof Woof:
It’s hard to say how many Woof Woofs (Woofen?) were made, but here at least is one that remains:
Contrapuntalism 
Is that yours? Jealous. You always find the good stuff!
Enjoy!
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No, not this time. 🙂
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My granddaughter would like this. She has learned that a dog (at least an English-speaking dog) says “Woof, woof!”
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