sue - more info is needed to dtermine a remedy

has his appetite changes since he became ill? does he desire anything specific? Has his temperment changed? Seeking affection, avoiding it? has anything changed in his demeaner at all? How often has he been eating grass? etc.

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Man, do not pride yourself on your superiority to animals. For they are without sin and you in your greatness defile the earth by your appearance on it and leave traces of you foulness after you. Dostoyevsky