If you go over to http://www.perelandra-ltd.com you will find a recommendation for this. It consists of your dog's taking three essences per day; they are part of her line of Microbial Balancing formulae -- for the Immune, Lymphatic and Respiratory.
Perelandra is an amazing place and it is where I learned how to communicate with Nature in my garden, as well as for a particular health program. Machaelle Small Wright has been running an experimental garden with Nature for two decades.
She has just issued a bulletin about this flu and dogs.