Krill oil is very high in omega 3, higher than fish oil & easily absorbed by the body's cells.
A study that the Journal of the American Veterinary Medical Association conducted in March 2010 (AVMA) showed that dogs that were given omega 3's had reduced signs of osteoarthritis.
An Error Occurred Setting Your User Cookie Conclusions and Clinical Relevance—Results suggested that in dogs with chronic osteoarthritis receiving carprofen because of signs of pain, feeding a diet supplemented with fish oil omega-3 fatty acids may allow for a reduction in carprofen dosage.
Not sure why it says an error occurred, but if you click on the link, it takes you to the AVMA page.