Willi is a 12-year old spayed female dog, so she can't have puppies. She has never had any puppies.
Is your female dog spayed, too? She should be, just like Willi! A healthy female dog can give birth many times during its life, bringing into the world half a dozen puppies each time. The problem is that there just aren't enough good homes for all of the puppies being born to all the dogs out there. Each year, in fact, 10 million dogs and cats are put to death in animal shelters across the United States for exactly this reason.
We 'spay' female dogs and 'neuter' male dogs. These are the terms we use to describe fixing dogs so that they can't produce any more babies.
Remember Doley from the WILLI book? Doley is a neutered male dog. Good, huh?!
