Non-profit Foundations
Golden Retriever Foundation (GRF) http://goldenretrieverfoundation.org/
AKC Canine Health Foundation (CHF) http://akcchf.org/
Morris Animal Foundation (MAF) http://morrisanimalfoundation.org/
Orthopedic Foundation for Animals (OFA) http://ofa.org/
Veterinary Medical Societies (Search for a Specialist)
American Veterinary Medical Association https://www.avma.org/Pages/home.aspx
American College of Veterinary Behaviorists http://www.dacvb.org/
American College of Veterinary Dermatology http://www.acvd.org/
American College of Veterinary Internal Medicine http://www.acvim.org/
(includes Cardiology, Neurology, Small Animal Internal Medicine, Oncology)
American College of Veterinary Ophthalmologists http://www.acvo.org/
American College of Veterinary Surgeons http://www.acvs.org/
American College of Veterinary Sports Medicine and Rehabilitation http://vsmr.org/board.html
Health Testing
Orthopedic Foundation for Animals (OFA): hips, elbows, heart, eyes, other http://ofa.org/
Optigen: DNA tests http://optigen.com/
VetGen: DNA tests http://www.vetgen.com/
Animal Health Trust (AHT): DNA tests http://www.aht.org.uk/
Canine Health Information Center (CHIC): Parent Club health testing recommendations http://www.caninehealthinfo.org/
Databases
OFA (approved searchable health test database, independently verified data) http://ofa.org/
CERF (approved searchable eye exam database, independently verified data) http://web.vmdb.org/home/
K9Data (privately owned pedigree database, owner-reported health data) http://k9data.com/
GoldenDNA (privately owned DNA test database, owner-reported health data) http://goldendna.com/
Research (to submit blood and/or tissue samples)
Breen Lab (cancer) http://www.breenlab.org/
Broad Institute (cancer, other diseases) http://www.dogdna.org/
Modiano Lab (cancer) http://www.modianolab.org/
Townsend Lab (pigmentary uveitis) website coming soon
CHIC DNA Repository (healthy dogs and dogs with any disease) http://www.caninehealthinfo.org/dnabank.html
Health Information
MedicineNet (Pet Health Center from WebMD) http://www.medicinenet.com/pets/pethealth/focus.htm
Veterinary Partner http://www.veterinarypartner.com/
Merck Veterinary Manual http://www.merckmanuals.com/vet/index.html
Colorado State Animal Cancer Center http://www.csuanimalcancercenter.org/
AKC Canine Health Foundation Podcasts http://akcchf.org/
Baker Institute for Companion Animal Health http://bakerinstitute.vet.cornell.edu/animalhealth/
Canine Epilepsy Network http://www.canine-epilepsy.net/
Canine Histiocytosis http://www.histiocytosis.ucdavis.edu/
Veterinary Clinical Trials
Animal Medical Center, New York, NY http://www.amcny.org/veterinary-community/clinical-trials
AKC Canine Health Foundation List http://akcchf.org/
Colorado State University http://csu-cvmbs.colostate.edu/vth/veterinarians/clinical-trials/Pages/default.aspx
National Cancer Institute Comparative Oncology Programhttps://ccrod.cancer.gov/confluence/display/CCRCOPWeb/Clinical+Trials
Texas A&M University http://vetmed.tamu.edu/clinical-trials
University of Minnesota http://www.cvm.umn.edu/cic/current/home.html
University of Wisconsin http://uwveterinarycare.wisc.edu/clinical-trials/
Veterinary Cancer Society http://www.vetcancertrials.org/
Health Clinic Locations and Schedules (eyes, hearts, x-rays, and other tests)
OFA http://www.ofa.org/
Cavalier Health Test Clinic Schedule http://www.cavalierhealth.org/health_clinics.htm
Also check local dog clubs in your area and the GRCA event calendar, https://grca.org/events/event-calendar/other-events/