The following reputable organizations provide an abundance of information on pet health that you can trust.
Veterinary Partners, http://www.veterinarypartner.com
American Heartworm Society, www.heartwormsociety.org
Companion Animal Parasite Council, http://www.capcvet.org/
ASPCA Poison Control Center, www.aspca.org/pet-care/poison-...
American Animal Hospital Association Healthy Pets, www.healthypet.com
American Veterinary Medical Association, www.avma.org
Tufts Veterinary Hospital, http://www.tufts.edu/vet/fhsa/
Cornell University College of Veterinary Medicine Feline Center, www.vet.cornell.edu/fhc
The Humane Society of the U.S., www.humanesociety.org
Veterinary-Verified Internet Pharmacy Sites, for a listing of accredited pharmacies, http://www.nabp.net/news/new-vet-vipps-accreditation/