A husky is a sled dog used in the polar regions. One can differentiate huskies from other dog types by their fast pulling-style. Modern racing huskies (also known as Alaskan huskies) represent an ever-changing crossbreed of the fastest dogs (the Alaskan Malamute, by contrast, pulled heavier loads at a slower speed). Humans use huskies in sled-dog racing. Various companies have marketed tourist treks with dog sledges for adventure travelers in snow regions. Huskies are also kept as pets, and groups work to find new pet homes for retired racing and adventure-trekking dogs.