It will do the same thing when you run it up against the head of a hard-charging German Shepherd. So when things get real, be prepared to pull it down at a rapid rate if you have to make a quick second (or third) pass. Thats exactly what I did, however the first pass was sufficient to re-format that dawgs hard-drive. The customers daughters let that Dern-Fool Dawg out and gave it the chance it had waiting for all season. I wear Motorcycle Goggles that block some of my peripheral vision, so with my head down, all saw was a fleeting glimpse of a large white object coming fast and low at 10 Oclock about 3 feet away. No barking, this dawg wanted action. I was already on alert status due to an earlier sighting of three highly active hornets. There wasnt even time to say NO! In the blink of an eye, I whipped that edger-head across my body and felt that Stihl FC85 Edger/Dawg-Whacker jump about a foot. So I knew there was solid contact. Then I felt myself recovering from that jump and moving for another pass before there was time to think. It was one of those classic slow-motion deals that actually only took a few seconds. While I was at the ready for more action, that White German Shepherd was moving away at a rapid (albeit skewed) gait. Its head was cocked down and twisted to the right, so I thought it might have been hit in the eye. It tried to yelp, but I got the distinct impression there were immense waves of pain coursing through its head. So as it weaved a crooked path back across the open yard to a familiar refuge, the dawg was making some VERY weird noises. I started to continue working, but I thought that MIGHT seem a little cold, hehe. So I left the engine running on my trusty Dawg-Whacker and went to see if it lost an eye. No eye damage, but I did put something on that dawgs head that Ajax wont take off. Last I saw, they were taking Sugar to the Vet for stitches, but itll be lucky if it doesnt have a cracked head-bone. Dont get me wrong, I LOVE dogs. Maybe its the Chinaman in me, hehe. Just kidding, because I dont like to hurt animals. Never the less, when they attack, for ANY reason, I will use (and do) anything to turn the tables. Of all the dogs Ive been around, Ive NEVER seen a stable White German Shepherd. Seems like I heard something about a lot of in-breeding with those things. I know Im fortunate not to have had my back turned (or running the blower) when that crazed dog made its move, but I had made my mind up a long time ago about this circumstance (should it arise). No thinking, no time, it was all pure reaction. That customer is lucky in many ways. I dont have to go to the hospital. And they know for sure that they have a dangerous animal before it actually hurts someone. Though I doubt this will be enough of a warning for them to take appropriate action. I might have to change my call-sign to Dawg Smack.