Hi and welcome to the forum.

For play biting if my dogs bit to hard I would yelp and move away - stop playing and only return if the puppy was calm,

I believe grapes an raisins are poisionus so I wouldn't - mine love carrots though

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A dog Possesses Beauty without Vanity,Strength without Insolence, Courage without Ferocity, And all the Virtues of Man without his Vices.