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She does not approach in a threatening way, in fact it looks like she is going up to play with her and then suddenly attacks her. We originally used to dismiss it as too rough horseplay, but the thumps have got heavier as time has gone on. It is though Ozzie has annoyed her, she hits her and then it is all over. I don't think Ozzie is suffering from this behaviour, it is probably me who is doing the worrying! I probably can put it down to old age and having lived with each other for too long! Many thanks for your reply.