great pyrenees

We spent about 8 months looking for a suitable dog before we acquired Mac the Marshmallow last month. Until a little over a year ago, we had two American Working Farmcollies, half siblings. Rufus, our senior dog was an unusually large dog for his breed - half again the size of either parent or his sister, Mistress Quickly, and he died suddenly at 7 of a hidden heart condition that our vet says sometimes affects unusually large dogs. We knew that we did not want another farmcollie - or rather we did, we had loved Rufus, but that what we needed in working dog for our family was slightly…