I usually don't even try guessing dog breeds until the pup is at least 9 months old.

head looks all wrong to be a Bernese. ...I think. Though she could be big enough.

She *could* have some aussie or BC in her.

You could always tell them that she's a Peruvian Cattle Dog that was rescued from over seas, but you lost the paperwork during the move. (JUST KIDDING. Don't go that route.)