It's not even that simple: https://en.m.wikipedia.org/wiki/Cross-species_transmission

With pathogens that jump between species, as SARS-CoV-2 has with several populations, including white-tailed deer[1] in the US, you potentially need to isolate all reservoir species from each other as well.

[1]https://www.nature.com/articles/d41586-021-02110-8

Cross species transmission is rare and while some cases have been reported, they're really the exception rather than the norm.

If there was really that big of a risk where we'd need mammals to isolate as well, then veterinarian services the world over would have collapsed under the weight of house pets contracting the virus.

edit: curious about the downvotes. Perhaps you have proof that has eluded the virologists researching SARS-CoV-2. Please do speak up ;)

Why would they get severe disease when they get infected? Even most humans don't, let alone other species with different receptor setups. The virus is absolutely in non-human animal populations almost everywhere, and is not a candidate for eradication.

> Just have everybody stay at home simulataneously for 2 or 3 months.

You probably wrote this half-jokingly, but actually… this is exactly what Australia tried last year and … well it’s still trying.

It's not possible to have everyone in the whole world stay home for 2 months. That was never an option.