Extra large dog bred with a medium dog

Question
Hi i Have a 1 year old female dog she is half blue healer and half some kind of hound i went to visit family and now she is showing signs of being pregnant the father of the puppies would be a large great pyransese can having these puppies harm her?

Answer
Was she in heat when you bred her?  What days in her cycle was she?  She may be exhibiting a false pregnancy if you're lucky.

A Heeler is a tough little dog and could possibly be able to birth the pups -- it really depends on the "other half" of her gene pool.

Great Pyrenees pups can be very big I would do x-rays to see the size of the pups and the litter to determine if she's going to need some assistance.

Good luck