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First, have your parents ruled out any health problems? While 7 isn't particularly old for a small breed, neglect may speed up the aging process and age related health issues.
Second, is it possible that your parents are triggering a response from when the dog was neglected? If they keep a diary of events which happened before they discoverd the mess, they might see a pattern.
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If you're green, you're growing...if you're ripe, you're rotting!
I try to greet the world like my pets do...boundless enthusiasm, intense curiosity and no concept of yesterday and tomorrow.
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