Where Can I Find A Veterinary Database Of Qs And As Of Deseases?

Try these two wonderful sources:  

The Illustrated Veterinary Guide, second eddition, by Chris Pinney, DVM. This is a book for non-veterinarians; easy to follow and understand.

The Merck Veterinary Manual, ninth edition. This is the guide used by veterinarians. It's rather technical, but contains information the average pet owner can use.

Both these books can be purchased through Amazon. The Internet, unfortunately, contains no Q & A sites for pet owners. There is much information about all kinds of animals, but no central databased.