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He's killing them because it's an enjoyable activity for him. Dogs are amoral, so he doesn't think of it as being wrong. He thinks, "Man, this is way better than a squeaky toy . . . it tries to run away and fight back and it's exciting as heck!" I strongly recommend that you never leave this dog unsupervised around the Jack Russell terriers and, needless to say, never around a cat either.
BTW, are you certain it was the pittie who killed the cats and not one or both of the Jack Russells? Terriers can also be aggressive towards other animals . . . They were bred to hunt "vermin" like rats, etc. Don't let their size fool you, a terrier CAN kill a cat. Unless you're 100% sure, I wouldn't leave the Jack Russells around cats unattended either.
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