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Not sure if this completely answers your question but the WHO guide to water safety planning considered animals in the process, and highlights what some of the risks might be and how to address them; https://apps.who.int/iris/bitstream/10665/75145/1/9789241548427_eng.pdf

I have been told previously (thought I don't have a reference) that all mammal digestive systems are very similar therefore many of the bacteria that can be present in our poo can also be in animal poo. It's sounds feasible to me and is maybe a way to explain it to people, though I'd be happy to hear from someone more knowledgeable....