Here are some possibilities:
* Veterinary drugs: There are many medications used in veterinary medicine. If you can recall any details about the context where you heard "Vetrogen," it might help to narrow down the possibilities.
* A product name: It could be a brand name for a specific product or medication.
* A misspelling: The word may be a misspelling of a similar-sounding term.
To help me understand better, please provide more information about where you encountered this term.