My borzoi attacked and killed а pitbull, what should A neighbor's pitbull got loose and started coming at and my little girls while on a walk yesterday. Had my Borzoi with on the walk and let him loos

My borzoi attacked and killed а
pitbull, what should
A neighbor's pitbull got loose and started
coming at and my little girls while on a walk
yesterday. Had my Borzoi with on the walk
and let him loose and got my kids to stand
behind me. thought my dog was a goner but
was wrong. My dog tore up the pitbull while his
owner was yelling and screaming, trying to kick
my dog off. His dog went into shock and died a
few hours later at the vet.