This is a question that I've tried to research over the internet over the last 6 months. There is little in-depth information on these as they pertain to dogs. Double P II was prescribed for Nathan at the time of the injury by the vet who was doing the acupuncture at that time. What little research I found on that drug suggested it was toxic over time. So, I did not use it for more than 1 week. The vet who is currently doing Nathan's acupuncture prescribed Ba Ji San, and on this most recent visit, Hindquarter Weakness.
With all the therapy going on at the same time, its impossible to isolate the impact of these herbs. That being said, Nathan has been on the Hindquarter Weakness herb for almost 5 days now. I do see some improvement in the strength of his weaker right leg. His gait is steadier now than it was a week ago, although his overall endurance has not increased measurably.
In any case, the boys are both ready now for Halloween!!