I phoned the owner today. The left hind limb is back to normal but the right hind limb is swollen.
Shifting leg lameness is a characteristic of Lyme Disease in the dog.
UPDATE ON FEB 16, 2014
The owner phoned to say that the dog has recovered and is no longer having back limb swellings since 2 weeks ago. She asked if the medicaion of vibravet and anti-inflammatory and k/d diet need to be continued. I advised a blood test as soon as possible and to maintain on the k/d diet for around 3 months. Without a blood test, it is hard to advise properly.