Got a border collie cocker mix. Great dog. Very obedient. Rarely walk her on a leash so she can chase any squirrels she sees. Loves to herd anything that runs. One day on our walk a big tomcat struts out in front of us. Sage looks at me like, "can I herd it?!" "Get the kitty I say" and off she goes. Cat runs about 50 feet then stops, turns, gets this look like, "why am I afraid of that?" and starts running back at Sage. About two seconds later Sage is hiding behind me. My dog is a big wimp. Some cats are tough. I am pretty sure that cat would have turned and chased anything that bothered it.