I used Water Dog on my first lab, no issues, worked great and couldn't have asked for more out of my lab. Attempted to use it on my second lab, and it wasn't long before I realized it wasn't going to work. Either my first lab had an extremely high IQ and the second one didn't or a combo of both lol. Turned out to be a combo of both. I ended up taking him to a friend who does it on the side. He said himself that the lab was a challenge, but eventually came around and he's been a good one also.