It's bad to not train your pets properly.
Willie juts got a new puppy that doesn't know how to behave properly and is frequently out of control.
Willie wants to train his puppy.
Willie takes his puppy to a dog training school and gets him enrolled in a comprehensive course that lasts for a few months.
Willie decides to train the puppy himself even though he has no prior experience with training animals or knowledge of canine behavior.
Willie's puppy is trained perfectly by the experienced trainer at the school and it greatly improves its behavior around others.
Willie's puppy is trained to a certain degree but it only obeys Willie  and often fails to respond to other people's commands.