The leash

I was looking at a small dog barking outside a convenience store hoping her

Owner would come out so they could continue their promenade.  I noticed that the dog jumped and reached a certain point where she stopped completely as “pulled by an invisible rope”, I forgot to mention she was unleashed.

When her owner came out of the store I asked him how old the dog was and commented on how well trained she was since she stood outside waiting for him and never tried to get into the store, although she looked so anxious to do it.