Rabies Pellagra (niacin or Vitamin B3 deficiency)[6] Gastroesophageal reflux disease, in such cases specifically called a water brash (a loosely defined layman term), and is characterized by a sour fluid or almost tasteless saliva in the mouth[7] Gastroparesis (main symptoms are nausea, vomiting, and reflux) Pregnancy Excessive starch intake Anxiety (common sign of separation anxiety in dogs) Pancreatitis Liver disease Serotonin syndrome Mouth ulcers[medical citation needed] Oral infections Sjögren syndrome (an early symptom in some patients) [8]