Dogs, just as children, need consistency in their life in order to learn which behaviours are acceptable and which are not. Allowing jumping up on people one day, then punishing it the next, teaches a dog nothing but the fact that you are not being fair in the requirements of your dogs behaviour.Consistency in training allows good behaviour to catch on more quickly, and helps to eliminate inappropriate behaviours in a much speedier manner than being wishy-washy with your dog.
Consistency garners success in training your dog, and who doesn't want to be successful?
So remember, when teaching your dog, be it basic obedience, or extinguishing inappropriate behaviours, you will have the best results by being consistent in what you are asking of your dog.
