Hair Restorer - natural remedies?

Karmel is losing hair all over her body, as the pistules from her illness dry up. I have used comfrey for hair restoration on my horses, when they have had an injury involving hair loss, but, it's sticky, so no good for a dog which lies down sleeping much of the day! Can anyone recommend a natural remedy which I can buy in France, which will help restore the hair and return my galga to her beauty?