Hard to tell, but maybe Chow - what male dogs are around? She should get her females spayed to prevent any more unplanned litters, if they've already been bred several times, as you say, it's probably for the best for them anyway.
The pup is adorable, it will be interesting to see how big he gets. I don't see Bernese in him at all. Is his mother a fawn Mastiff?
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