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Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
This white chalky stool is usually due to a problem with the bile ducts and or digestive system. Even though Sadie is acting normal, something is going on within her digestive system and/or liver so it is important that you take Sadie to your vet for a complete exam with blood work. Considering Sadie's age, there may be something underlying that could be treated to give her a longer life.
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Sincerely, Dr. Loretta