NO, NO! BAD DOG!!
What a great word that just rolls off our tongue with any dog that tends to get into mischief, especially puppies! What is important is to understand how dogs think. Dogs are very literal. They need precise meanings to words we teach them. We also have to understand that we teach them English. They are not preprogrammed to understand the meaning of our verbalization. Consequently, the best thing we can do is to have very clear meanings in our vocabulary of what a term/command means. If we do not have a very clear visualization of what a word means, we will have a very hard time teaching it to our dog.