Proofing is basically training your dog to obey regardless of what is going on around it. Concrete technique: Once the dog knows what you want from it and recognizes your cue, you start training this is varying environments, ensuring that the dog is performing reliably in one environment before increasing the level of difficulty by training in another environment. The order of environment training could for example be: - in your living room - in your garden - on the street - in the city - in the park - at dog training classes - among playing dogs - on a field filled with small game wildlife etc. The exact order is all about knowing your dog. For some dogs, other dogs will be the highest distraction, for others it's a running hare, cats, people, loud noises, cars and so on and so on. Proofing is also teaching your dog to respond to a cue regardless of your position whether you're standing up, lying down, having your back to it or doing a hand stand. How to train the proofing is another matter. I prefer to increase distraction levels so gradually that I have little problem getting my dog's attention, so that I'm setting her up for a 90% guaranteed success. I will correct, but usually only with a "no". If I cannot get her attention or if I find myself correcting her several times, then I know I've gone forward too fast. Other trainers use more aversion based methods to proof their dog, which I believe in general works faster than the method I'm using, but it's just not a method for me.