Write the next sentence in the following story.

How to choose a puppy by temperament
Learn all you can about the different temperaments puppies can have.
In general, puppies are classified as responsive, nervous, aggressive or independent.
A responsive puppy is adaptable and binds well with humans, which makes it a good choice for a first-time dog owner.
A nervous or shy puppy is unpredictable, and not a good choice for families with children or other busy households. An aggressive puppy is dominant, sometimes unpredictable and does best in a household without children or other pets.