1/2 Great Pyrenees 1/2 Border Collie, Cassidy protects our free range chickens and patrols the borders of our property. She has a loud bark but she is sweet and I trust her 100% with our 1 year old son. Cassidy has the body of a border collie but the temperment of a Pyrenees. We're looking for a Great Pyrenees male to mate with her to bring out her protective instincts and hopefully make puppies of a slightly larger build.