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.
Timeline of related events
1725Publication of Egyptian Secrets of Albertus Magnus (lists this spell)
1869English-language translation of Egyptian Secrets (lists this spell)