One million stray dogs and 500,000 stray cats live in New York City metropolitan area. There are about 100 million dogs and cats in the United States. Americans spend more than 5.5 billion on their pets each year. Every hour, 12,500 puppies are born in the US.

Wolves have only one breeding season per year – in the winter. They have their puppies in late April or early May. They have their puppies in an underground hole, or den. There are usually four to six puppies in a litter. The puppies grow up fast and are their adult size by the end of their first winter. They are grown up by the time they are two years old.