This is what I do for a living.
This is what I used to do for a living.
and this too....
A list I've been maintaining since roughly 2001. By no means is it comprehensive or 100% current. There are other published lists, albeit few. I do make updates from time to time.
A collection of useful tips found while researching natural alternatives to the popular Spot-on products found in pet stores, super markets, and those prescribed by many veterinarians