Burnsway, Dr. Knapp has a supplement she can put ur dog on to help his immune system. It's not expensive, worth trying.
Also Fallon, my lab is 14 1/2 years old, she is a little arthritic but going strong. She gets an Omega 3 fish oil & a glucosamine/chrondroitin pill daily plus ground milk thistle. I give her 1/2 frozen raw patty everyday and she eats Acana & Taste of the Wild......I rotate between the fish & lamb, I like these because protein content is lower.
Her brother lived to be 15. 4951