These two sites are a wonderful resource on dog and cat health, with a number of excellent links as well as, on Vetinfo, a searchable database of questions from people about their pets' health problems and a veterinarian's answers. These are good places to do a search on a condition or symptoms you are worried about.

http://www.vetinfo.com/

http://www.veterinarypartner.com/Con...=1&SourceID=42