I am just going to add, when I had my mastiff and golden retriever as puppies, they grew up together very nicely. My female mastiff was dominant over the male retriever. Unfortunately my mastiff was re-homed because of other dog aggression, but loved and guided the golden. After the mastiff left the home my golden became shy and somewhat nervous as though he lost his very confident friend. He did grow up rather happy but was definitely traumatized by the loss of his pal. You mentioned the loss of a recent dog? Those two girls are probably fighting for their rank in the family. Professional training will help. Sorry for the long story, I hope everything works out.
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