There was a treatment available, but was very expensive. After the picture went viral, the guy got multiple offers from people to pay for the dog's treatment. I haven't heard the eventual outcome.
This picture is more like "unconditional trust".
Unfortunately, the dog died just this week.
Schoep, Arthritic Dog Whose Photo Touched Millions, Dies
http://shine.yahoo.com/pets/schoep-arthritic-dog-whose-photo-touched-millions-dies-181600152.html