That is really scarey!
You don't know who the dog belonged to? Hopefully it was a one time thing where the dog was let out accidentally and wont happen again. I'd probably be very leary to take a walk again until I knew for sure though.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226