I train by animal learning theory. I use positive reinforcment (food, toys, praise, etc) and negative punishment (time outs). I never use positive punishment (yelling, leash pops, scolding, hitting, shaker cans, spray bottles, etc) or negative reinforment (ear pinches, etc).

Dr Ian Dunbar, Karen Pryor & Jean Donaldson are some of the biggest names in founding the use of animal learning theory with pet dogs.