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0 No pain
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Bright, eating, sleeping comfortably, grooming, affectionate
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1 Mild discomfort
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Eats, sleeps, resists surgical palpation, not depressed
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2 Mild pain
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Picks at food, guards surgical area, slightly depressed
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3 Mild to moderate
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Inappetant, guards/ looks/ licks/ chews surgical area, unrelaxed, whimpers
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4 Moderate
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Depressed, reluctant to move, aggressive, may vocalise, mydriasis
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5 Increased moderate
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As 4, but more pronounced
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6 Moderate to severe
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Very depressed, will not move even to urinate, vocalises often
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7 Severe
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Motionless, extremely depressed, vocalises
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8 Increased severe
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As 7, hyperalgesic wherever touched, trembling
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9 Excruciating
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Piercing screams, nearly comatose
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