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Oliver didn't just jump from great heights, however, he also whined and barked for help; he clawed and gnawed on furniture, floors, doors, sheets, towels, pillows, and anything else within reach; he panted and salivated, licked himself raw, and tried to bolt. Other dogs poop and pee where they're not supposed to. A few others express their anxiety by withdrawing deeply into themselves and growing less active; these are the drooly, quiet martyrs. Sometimes they stop eating. Christensen believes that anorexia when a dog won't eat or drink when she is alone, can be a sign of separation anxiety. Emotional eating in dogs, she said, usually means not eating.
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Laurel Braitman (Animal Madness: How Anxious Dogs, Compulsive Parrots, and Elephants in Recovery Help Us Understand Ourselves)