My husband and I have a 6 yr old, female, Sable Sheltie and 2 cats. The sheltie is very very intelligent, we will play hide and seek with her toys and she finds them every time no matter where we hide them. She has full run of our house, she also sleeps with us at night. While we are asleep she will peer out the window, since our bed is next to it. She leaves snark marks on the glass from her nose pressing against the glass, we love our pets.