We heard about Transfer Factor sometime last year and some readers had reported good results after using it on their pets.
About Transfer Factor: http://en.wikipedia.org/wiki/Transfer_factor
Here is another sharing from a reader:
Transfer Factor seems to be helping a lot of sick pets. My vet gave to a 15++ years old Labrador who has left heart failure,pneumonia, was placid and not eating after almost a month now is now running around up and down the garden and eating well. She also gave it to an FIP cat and the cat seemed to be getting better.
If you would like to try it on your pets, our advice would be to consult your vet for professional advice.
This is just a sharing and our disclaimer holds.