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    Diarrhea in Dogs: Causes and Treatment

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    ASPCA logo Diarrhea is characterized by frequent loose or liquid bowel movements. It can be caused by something as simple as a change in diet or a more serious illness or infection. Diarrhea may be sudden in onset and short in duration. It can also last for weeks to months or occur off and on. A single bout of diarrhea is generally not a cause for concern in dogs -- but if it persists for more than a day, it can lead to dehydration, or it may indicate an underlying health issue and should be checked out by a veterinarian.

    What Causes Diarrhea in Dogs?

    • Change in diet
    • Food intolerance
    • Ingestion of garbage or spoiled food
    • Ingestion of poisonous substances or toxic plant material
    • Ingestion of foreign body (for example, toy, rubber band, plastic bag, etc.)
    • Allergic reaction
    • Bacterial or viral infection
    • Internal parasites, such as roundworms, coccidia and giardia
    • Inflammatory bowel disease
    • Kidney or liver disease
    • Cancer or other tumors of the digestive tract
    • Certain medications
    • Colitis
    • Stress
    • Hemmorhagic gastroenteritis

    What Are the General Symptoms of Diarrhea?

    Loose or liquid, frequent stools are the most common symptoms of diarrhea in dogs. Other signs include flatulence, blood or mucus in stool, changes in volume of stool and straining to defecate. Lethargy, dehydration, fever, vomiting, decreased appetite, weight loss and an increased urgency to defecate may also accompany diarrhea.

    If your dog’s diarrhea is black, he could be experiencing internal bleeding of the stomach or small intestine and should be examined by a vet immediately.

    How Do I Treat Diarrhea?

    It is often recommended that you avoid giving your dog any food for 12-24 hours while he’s experiencing diarrhea, but do provide plenty of fresh, clean water to stave off dehydration. Check with your veterinarian about the proper course of treatment for your dog’s specific case.

    When Should I Take My Dog to the Vet?

    Bring your dog to the vet if his diarrhea continues for more than a day, or if you observe lethargy, vomiting, fever, dark-colored or bloody stools, straining to defecate, decreased appetite or unexplained weight loss. Contact your veterinarian immediately if you notice your puppy has diarrhea, as it can be an important indicator of serious diseases in young dogs.

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