The Great Pyrenees is a livestock guardian from the mountains between France and Spain, where big white dogs stayed with flocks and watched for wolves, bears and thieves. It's a giant breed, usually 85 to 120 pounds, with a thick white double coat that can carry gray, tan or reddish-brown markings, and double dewclaws on each hind leg.
That working history shows up at home. Many Pyrs are calm and gentle with their families, but they were bred to decide things alone, so training takes patience and rewards rather than commands. They tend to bark at night, test fences and shed heavily, which matters on a quiet street or in a yard that borders the neighbors. Each dog varies, so watch how a Pyr behaves before you commit.