I have a yellow lab. I consider him extremely intelligent and has at least a 10 to 20 word vocabulary. Come, Stay, Sit, Wait, Gentile, No, Come, Show me the drill, (He runs into his create for a treat) Down, Stop, Play, Go get it, and a few others. He fetches well in the back yard. In the front yard forget it. One note: he is also a rescue. (Last stop) so to speak. I figure as a result of his abuse as a puppy he was quite a handful. Long story short, after 2 years "Tugger" was not the same dog we brought home. Much improved but still some issues with guests and especially food. We had some success, but some behaviors still persisted. Bolting out the front door for one. Running in front of moving vehicles, chasing cars, people, kids on bikes. On a leash he was also problematic. We tried chokers, harnesses etc.. I also had a problem with the Mrs... even ordering this, but for the sake of the dog I needed to try something else. When it arrived I followed all the instructions and let it charge over night. The following morning I even tried all the settings on myself. Getting up past 4 was painful. 7 was downright painful, but at least I had a understanding of what he would experience. My results: After putting the collar on Tugger. I hit the tone then the vibrate while still in the house so I could see his reaction. I wish I had video becasue it was a riot. Opened the front door and off he went like a gazelle. He ran right into the street. When I called him and pressed the tone button, nothing. Called him again and pressed the vibrate, nada.. Not even lifted his head in acknowledgement. I quickly spun the dial to 7, gave another command which was ignored as well and let him have it! I swear he jumped 6 feet in the air. I called "TUGGER" again and he immediately came to my side. I told him to sit which was so immediate it made a thump when his butt hit the ground. I said "OK lets go" and I started walking. I think I gave him one shot at the 1 setting during our 2 mile walk. He stayed close and healed on command. He stayed right by my side. Fast forward 2 months. He is still a bit rushed out the door but will wait till I cross the threshold if I insist. But he doesn't leave the porch without me. When I grab the collar he gets all excited because it means we are going for a walk. There was a time when the kids put the collar on him but forgot to turn it on. We went for our usual 2 mile walk without issue. When we got back home i took the collar off and thats when I noticed it wasn't even turned on. Our walks are fun and we both enjoy it now. We regularly go to the park up the street and regardless if there are dogs or people around he looks to me for permission to venture too from my side. From day one with this device the transformation was instantaneous. I wish I hadn't waited so long before getting it. If he ventures to far from me a simple "COME" and a press of the tone button and he immediately responds without hesitation. That's my experience. great device. Humane, quick results.