Jennifer,

Lady does the exact same thing as Duncan, to the point that I now put the leash on her whenever we go out. I have a lake close to home where there are a lot of people, bikers and joggers. Occasionally, we would take Lady off the leash and she would just walk with us for the full 3 miles around the lake. Lately, she has been misbehaving. God forbid she sees a bird on the grass or in the lake = she goes bezerk trying to catch them! The other day she saw a large cat and pulled the leash so hard she almost knocked me down! The weird part is that it doesn't happen with all cats, only with large ones. My next-door neighbor has a few kittens or young cats and Lady is ok with them. I don't know what the solution is on this one.