Don't know who owned the domain in the past but the present owners are more than trustworthy and pose no threats. The AAHA is an organisation supporting and providing information to the veterinary industry.
I rate as trustworthy and child safe. For some reason WOT won't save my rating.
This website is of the highest integrity and I use it daily. there is no reason for this warning. It is the website for the American animal hospital association and is used by thousands of veterinarians and their staffs daily.