I don't know if anyone has had issues with their lab exhibiting a strong predatory drive, but my ordinarily mellow and friendly chocolate, Daisy, has suddenly started killing snakes. This past summer there have been a surprisingly large number of rattlesnakes all over my usual hiking trails. Rattlers are usually extremely rare where I live because it doesn't get or stay hot enough for them. So, off leash romping has always been safe and most of the trails allow dogs off leash. Earlier this summer, we encountered a rattlesnake on an overgrown trail. I heard the rattle and managed to grab two of my dogs, but my chocolate took off after it before I could stop her. I couldn't go get her without endangering my other two dogs and all voice recall was lost once she saw that snake. Another hiker approached from the other direction and in a flash, Daisy grabbed the snake by neck and shook it to death right in front of us. I had to chase her down because she was running around with the snake in her mouth. We rushed back to the car and to the vet and after a thorough examination it was determined she had not been bitten. Since then I have avoided the narrow, overgrown trails and tried to hike in the cooler parts of the day and I've been keeping her on leash. Yesterday, we encountered another rattlesnake on a wide, heavily trafficked trail. It had rattled at two people coming the other direction and Daisy pulled out of her collar, cornered the snake and had killed it practically before I could even think. Another rush to the vet, no bite. These were definitely rattlesnakes-I saw the rattle and heard it. She has never done anything like this; she's 8years old and I've had her since she was 8 weeks old. I am concerned she has developed a taste for killing rattlesnakes--it seems she's protecting me and possibly other hikers, but this is a highly dangerous activity. Has anyone experienced a late-onset taste for the kill in their labs? Is it too late for rattlesnake training?