I am absolutely thrilled with my four week program. I have a 19 month 115lb Great Dane, who before meeting Patrick our trainer was a total headache when meeting people or seeing other dogs. At 115 lbs & still a puppy he has loads of energy & only greeted people by, wanting to jump on them. 115 lb puppy jumping on you is dangerous. After the 1st class I saw a huge improvement. The next day, our walk was so much easier. The collar is a great training tool. It let's him understand what I want from him, which makes it easier to take him places. I never have to constantly press the button & now after just 4 weeks he is off leash. I honestly recommend All American K9 training. This program benefits the owner & the pet. My puppy has no problem with the collar. First thing in the morning we go for our walk. When I grab the collar he wags his tail since he knows we are going on an adventure. Needless to say its a great investment, and stops the possibility of a liability due to having an untrained pet.