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Vitamin D poisoning occurs when a dog ingests a toxic dose of vitamin D. Common sources of vitamin D poisoning include rodenticides that contain vitamin D and certain human medications.
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Von Willebrand's disease is an inherited bleeding disorder. Cats with von Willebrand's disease lack von Willebrand's factor, a blood protein that helps platelets adhere to sites of blood vessel injury. Although affected cats have normal platelets, they experience clotting difficulties because their platelets do not properly adhere to injury sites.
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Xanthine bladder stones are an uncommon type of urinary stone that can occur in both dogs and cats. Xanthine is produced when purines (a component of animal proteins) are broken down within the body. Most cats can further break down xanthine into other substances that are easily excreted, but some cats are deficient in an enzyme that is required for this breakdown to occur. These cats develop elevated levels of xanthine in the urine, resulting in xanthine stones forming within the urinary tract. Xanthine urinary tract stones are typically removed surgically. Affected cats require long-term care to prevent recurrence.