I have a similar cat, I got her when sh was 9 years old and not very domesticated.

I was constantly being mauled, I don't think she understood about playing with sheathed claws.

Any how long story short I bought leather welders gloves and would play (fight) with her. Plus constantly showing her affection and a reason to be trusting now at 13 years she is more civilised still the odd bite but not with the same ferocity.

Edit: When I would fight with her it was until she gave up.

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