Hi Amy,
I’m sorry to hear about your pup’s troubles. You asked about things that can boost his immune system – here’s a link to an excellent article on the subject: http://www.victoriabenda.com/articles/jDodds/immune.shtml
You can have testing done to pinpoint immune issues; I had Dr. Dodds do my dog’s testing because I was referred to her by my vet. Based on the test results, my dog was taking
* Plant Sterols (Moducare, Thorne Labs)
*Turmeric/curcumin supplement (Merina)
*Vitamin E d-alpha tocopheral
*Vitamin C / Ester C
The daily amounts were specific to my dog & based on weight, so you would need to consult a vet for correct dosages for your dog. There is a list at the end of the article that includes other immune support supplements.
Good luck!
Corinne
