Below are resource suggestions, none of which we have any personal investment in. Be sure and do your due diligence when seeking health, food, disease, product, etc., information.

Breed Info: www.pwdca.org 
Canine Health Foundation: http://akcchf.org/
PWD Foundation info: http://www.pwdinfo.com
American Kennel Club (AKC): www.akc.org
Addison's Disease: http://www.dog-health-guide.org/addisonsdiseasedog.html
OFA Health Information: www.ofa.org
CHIC: http://www.caninehealthinfo.org/chicinfo.html
PWD breed book: https://www.amazon.com/New-Complete-Portuguese-Water-Dog/dp/1620457350

Dog food information and recall alerts: https://www.dogfoodadvisor.com/
Poison: https://www.aspca.org/pet-care/animal-poison-control
Poisonous Plants: Cornell University's Poisonous Plants Database