How to prevent any Dog from getting Mad (Spell)

From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:

Experiment made by a Mecklenburg Farmer, and by him re­lated how to prevent any Dog from getting Mad.

This man said: Dogs should have scraped silver filings given to them upon a piece of bread and butter, Christmas eve, New Year's eve, and on the eve of Epiphany. Dogs thus treated will never become mad or rabid.

The grimoire Egyptian Secrets of Albertus Magnus lists this spell.

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