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Dogs tremble and shake because they are scared, cold, excited or have a medical condition that is either chronic, viral or they have ingested certain types of poison. Chronic conditions include epilepsy or the onset of muscle weakness or failure which usually accompanies old age. Viral infections such as kennel cough or parvo will also cause trembling, as will the ingesting of boric acid, commonly used as rat poison. Shaking is common in some breeds of dog, like toy Chihuahuas, but severe trembling that goes on for any prolonged period, longer than ten minutes, usually is an indication that something is seriously wrong with the dog and he/she should be watched closely and, most likely, taken to the emergency room. Dogs, like people, go into shock as they are approaching death and the shaking is oftentimes a physical manifestation of this shock.

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16y ago

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