"suggestions"? or "opinions"?
Unless there is some massive outbreak among animals, like Parvo or Mad Cows Disease (aka, PMS), not sure there is much value to it as a domain.
Yes, animals do get "the flu" because most flus are a virus.
If you set up a site for the purpose of education, then you may have a better shot at branding this and perhaps making a decent ROI on PPC with google adsense or affiliate links.