I have a 10 week old Cocker SpanielPuppy who seems very smart. Unless it is very cold (I live in Minnesota)When I let her outside, she is starting to run from me when I call her. She sometimes does it in the house also. I don't want to always have her on the leash. I know of other people that can't let their dogs run but we have never has that problem. We have a cabin and I want her to be able to run and play and not always have to be tied up or on a leash.