The School of Veterinary Medicine’s Shelley Rankin warned of the hazards of letting dogs drink toilet water. In addition to the possibility of pets getting sick, Rankin said, “there are a whole bunch of diseases that we call zoonoses, that are technically present in animals and can be transmitted to humans.”
https://whyy.org/segments/is-it-safe-for-your-dog-to-drink-from-the-toilet/ “The Pulse,” (WHYY Radio)