She has a number of immune system issues as she aged and a weakened immune system leaves the dog's body prone to infection and illness. (fidoseofreality.com)
The chemical, perfluorooctane sulfonate, or PFOS, has been linked to liver and kidney problems as well as immune system issues. (politico.com)
Sucralose, the most popular «natural» sweetener on the market has the same chemical profile as a pesticide, and is causing immune system issues because of its effect on suppressing thymus function, as well as causing calcification of kidneys, and suppressing liver function. (energyfirst.com)