Jen,

I really meant it really doesn't matter to the people who are
attracted to the look of the dog & go visit him/her in person.
A shelter or Humane Society will ALWAYS give a mix breed dog
their best guess on heritage.And as NWS_Haven says, Pet Finder
does need to list a breed, whether pure or mixed. People who
adopt are ALWAYS given a best guess when the breed combo
is not known for sure.