The updated story by Hawaii News Now is the wife of the family that owned the dog had her baby in one hand and the leash of her dog in the other and was in the grassy area of HNL so the dog could P.  Then allegedly the leash "broke" and the dog lunged at the security officer who then shot the dog between the eyes which stopped the dog.   I have never heard of a modern leash that you buy at any pet store "break" especially the nylon strap type.  I have known and seen on a neighborhood street a big strong dog pull the leash out of an owners hand and then attack another dog that is on a leash.   I am an animal lover but often it is NOT the animal that is at fault but the owner and based on information from HNN, I don't see fault with the HNL security officer.