PetMD: Pet Resource Site
PetMD may be the most comprehensive pet health resource site on the web. It has outstanding information from come of the country's top veterinarians. It also has a fairly detailed "Ask The Vet" section and Symptom Checker. Spend some time in this informative site.
UNDERSTANDING YOUR DOG by James Aitken
A marvelous video documentary that should be seen by all dog owners.