she is attcking my older dog

I have 3 dogs 8 yr old male Fox terrier 6 year old female Jack Russell and 2 year old male Yorkshire terrier. My 2 older dogs sleep and eat together for years my 2 year old sleeps with me and gets in great with all dogs but sometimes annoys the older Fox terrier. But now recently my Jack Russell female will attack my older dog whom already has a sore leg and ny Jack Russell seems to know this abd keeps attacking his sore leg. Ny older dog is a good watch dog abd barks a lot and fir no reason my Jack Russell female will just attack him abd will not let go of him. Then the youngest dog will jump in and attack him too.could u help before one of then gets seriously hurt.

Thanks Michelle

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