[Buster Brown]

I did some research these site might help especially UC Davis. You do so much research LadyJane you may all ready have read these. Best wishes
Bacterial resistance to antimicrobials: From the Golden Age to the Bronze Age of antibiotic use - Veterinary Medicine

UC Davis School of Veterinary Medicine - Research Units

Antimicrobial Use Guidelines for Treatment of Urinary Tract Disease in Dogs and Cats: Antimicrobial Guidelines Working Group of the International Society for Companion Animal Infectious Diseases