How old is the dog? It could be from dehydration but I have also read that a dry gray stool is an indication of liver disease. Symptoms of liver disease in dogs | Pet Herbal Info Blog Quote:
Pale gray stools
Bile is made up of electrolytes, cholesterol, bile acids, bilirubin, (an orange yellow pigment in bile that forms as a product of hemoglobin) and globulins. It is produced and channeled by liver cells for storage in the gall bladder. Bile is important for drug elimination, re-circulation of red blood cells and absorption of fats from intestines into the blood stream. Bilirubin, which is toxic, must be detoxified and excreted into the intestines for further break up into urobilinogen. Urobilinogen gives stool its dark brown color. Liver disease may obstruct the bile duct and hamper this excretion resulting in pale gray colored feces.
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