Oh Corgis! Adorable! Good to see you 3dog! I would have sworn you were in VT!
DogAware.com Health: Arthritis in Dogs
more info than you probably ever want!
Adequan for Dogs
is a good article on Adequan, plus the website of the manufacturer has good info too. It's 8 loading doses - 2 a week for 4 weeks. Then you go from there - depends on the dog how often they need it (1-2x a month).
Holistic Care for Pets
at the bottom she also has really good information on pain in stages - I find her info easy to read/get.