What is the difference between "negative" and "positive" training?

What is the difference between "negative" and "positive" training?

Shelby Marlo, CPDT (Animal Behavioral Specialist, Professional Dog trainer) gives expert video advice on: How do I housebreak my dog?; How do I teach my dog that I am the "boss"? and more...

The difference between “negative” and “positive” training, is that in the old days, dog training came out of the military and so it's very punitive. If the dog didn't sit they would choke them in a choke chain. We learned since then that dogs are able to learn as early as six, seven, or eight weeks old. So, we use positive reinforcement to train dogs, meaning we use their food to train them; we make them work for their food. Dogs are much happier to do that than be choked by a choke chain.