I was sitting outback reading a book with Einstein (well, he wasn't actually reading), when a squirrel decided to make a run from the side of the house he'd been hiding on to the fence. He bolted and Ein took off after him and I was yelling for Einstein to stop since I didn't really want him to kill the squirrel. Einstein not only didn't stop, he didn't even register I was speaking at all. Not an ear twitch or a glance in my direction. He was so focused nothing I did mattered. Luckily after a few loops around the yard the squirrel dove under the fence and escaped and Ein just stood there intently sniffing where the squirrel had gone under. Even still he wouldn't listen when I called for him. It took him a good 20 seconds of sniffing to finally come back to me. Then I let Daisy out since she heard all the excitement and she sniffed around the yard a bit and ended up at the escape hole as well sniffing for at least a solid minute. Just goes to show dogs don't listen if there's something better to do and they have a GREAT sense of smell! I imagine it would take a LOT of training to get a herding dog to listen to actual commands instead of just running circles around the herd aimlessly. That takes overcoming instinct to listen to the owner. Can't imagine it's such an easy things to master.