My Mom, all 5 foot nothing of her, was not comfortable around strange dogs. One day when she went out to check the mail, a strange German Shepherd moved menacingly toward her and she was frozen with fright. Our Siamese cat Zachariah came tearing from the back yard to the front of the house and jumped on the menacing dog's neck. During the ensuing scuffle, Mom was able to retreat safely in to the house. The dog ran off, and Zachariah returned to the back yard to lick his balls or whatever cats do.