Cause

• If a dog's immune system is weakened, it can't fight the bacteria and yeast in its body. This results in an overabundance of microbes, which can travel through the bloodstream and cause systemic diseases.
  
  

Symptoms

• Yeast overgrowth can cause ear infections, skin irritation and digestive problems.
  
  

Treatment

• Giving a dog plain yogurt, which contains live active cultures of acidophilus, or acidophilus pills will help fight the "bad" bacteria and restore his immune system. Add a tablespoon of plain yogurt or a 10 mg acidophilus capsule to your dog's meals to help maintain his intestinal balance.
  
  

Side Effects

• The dog may scratch and have diarrhea as the toxins leave his body.
  
  

Warnings

• Too much acidophilus can cause a dog's immune system to become hypersensitive as it fights to find its equilibrium. If symptoms of diarrhea and upset stomach persist longer than two days, contact your veterinarian.