They may have suggested it becouse larger breed dogs need the mormones to help develop more of the skeltal structure for strength. But your folks will have to be very alert to her coming in to heat. and seprate them quickly. It would be very hard on little Emma to have pups at this age. It would be better to have her spay than that happen.
Sorry to hear the old boy is not doing so well. I am always nervous about reading your posts about him. Just love that pretty boy.