Im using the sport dog e-collar. I love this particular one b/c its water proof, and we go to the beach a lot during the summer time. His progress has been amazing with it. He's a totally different dog when its on. I dont use it to train him as much anymore, but i use it ALL THE TIME when i allow him off the leash, and its not a fenced in area..such as a dog park. I dont think i'll ever train another dog without it.Happy birthday, Lennox! Great photos.. is he wearing an e-collar? May I ask for training activity you are using it for and how it's progressing? thx