Last resort training?

Anyone that trains dogs know each dog is an individual. Even within the same breed and even in the same litters you will find easy to train dogs that just merely require repetition and then there are the hard headed dogs you need to knock in the head a few time just to get their attention. A seasoned trainer can tell the difference. What might work for one pup very well will not work for its sibling. Then you have to bring out the "Big Guns."