It went from a nice walk to a big mess!

I was walking my small dog half way down the block then there was a "BARK!BARK!BARK!BARK!" what do u know i have a HUGE Boxer RUNNING up to me and my SMALL,8 year old dog!I didnt know what to do im only 12!So it ran up to my dog and started sniffing her,i know shes kind of old but she CAN start a fight.So i picked her up and head home.I was SOOOO lucky my dog or the Boxer DIDNT get into a fight!