Chadden Hunter / Aerial view of hunting pack of Timber wolves (Canis lupus) in Arctic circle in Northern Canada, Taken on location for BBC Frozen Planet series, 2009

Mark Carwardine / Eurasian / European / Forest Wolf (Canis lupus lupus) head portrait resting on ground. Mongolia, August.

George Sanker / Portrait of Grey Wolf (Canis lupus). Yellowstone National Park, Wyoming, USA, October.

Grzegorz Lesniewski / Wild Carpathian Wolf (Canis lupus) running over snow. Bieszczady Mountains, the Carpathians, Poland, December.

Jeff Wilson / Adult Arctic wolf (Canis lupus) Ellesmere Island, Nunavut, Canada, June 2008. Taken on location for BBC series, Frozen Planet, Summer

Jeff Wilson / Arctic wolf (Canis lupus) on tundra, Ellesmere Island, Nunavut, Canada, June 2008. Taken on location for BBC series, Frozen Planet, Summer

Jeff Wilson / Two Arctic wolves (Canis lupus) in tundra landscape, Ellesmere Island, Nunavut , Canada, June 2008, Taken on location for BBC series, Frozen Planet, Summer

Klaus Echle / Red Fox (Vulpes vulpes) sat on a fallen tree in misty woodlands. Highly Commended in the Animals in their Environment category, Wildlife Photographer of the Year 2011.

Lassi Rautiainen / Wild Grey wolf (Canis lupus) walking, Kuhmo, Finland, September

Lassi Rautiainen / Brown bear (Ursus arctos) and Grey wolf (Canis lupus) together in wetlands, Kuhmo, Finland, July

Lassi Rautiainen / Wild Grey wolf (Canis lupus) Kuhmo, Finland, September

Lassi Rautiainen / Grey wolf (Canis lupus) in woodland in thick snow jumping up at eagle perched on dead tree stump overhead, Finland, December

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) cub in late evening light, Leicestershire, England, UK, July

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) cub in late evening light, Leicestershire, England, UK, July

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) resting amongst autumn leaves, Leicestershire, England, UK, September

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) resting amongst autumn leaves, looking up, scratching, Leicestershire, England, UK, September. Did you know? Each year around 100,000 foxes are killed on our roads but the over...

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) Leicestershire, England, UK, September. Did you know? The familiar red fox is hugely adaptable, and is now the most widespread canine species in the world.

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) cub in late evening light, Leicestershire, England, UK, July

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) cub approaching young boy in garden, Leicestershire, England, UK, July 2010. 2020VISION Exhibition. 2020VISION Book Plate.

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) cub in late evening light, Leicestershire, England, UK, July

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) cub in late evening light, Leicestershire, England, UK, July

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) vixen in snow, Cannock Chase, Staffordshire, England, UK, December

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) vixen in snow, Cannock Chase, Staffordshire, England, UK, December

Florian Möllers / Red fox (Vulpes vulpes) cub in garden of block of flats, Berlin, Germany. May 2006

Florian Möllers / Red fox (Vulpes vulpes) vixen nursing cubs in garden of block of flats, Berlin, Germany. May 2006

Anup Shah / Black-backed jackal (Canis mesomelas) male defending a kill from vultures after lions have finished - wide angle perspective, Masai Mara National Reserve, Kenya. February

Sergey Gorshkov / Red fox (Vulpes vulpes) sitting on fallen tree trunk, Kamchatka, Far east Russia, April

Sergey Gorshkov / Red fox (Vulpes vulpes) fox waking up from sleep in den in deep snow, stretching and yawning, Kamchatka, Far east Russia, November

Sergey Gorshkov / Red fox (Vulpes vulpes) two foxes at den in deep snow, Kamchatka, Far east Russia, November

Sergey Gorshkov / Red fox (Vulpes vulpes) carrying white grouse prey over snow, Kamchatka, Far east Russia, January

Sergey Gorshkov / Red fox (Vulpes vulpes) one fox chasing another across snow, Kamchatka, Far east Russia, April

Mark Raycroft / Chocolate Labrador Retriever (Canis familiaris)

Mark Raycroft / Black Labrador Retriever (Canis familiaris)

Mark Raycroft / Golden Retriever (Canis familiaris)

Mark Raycroft / Golden Retriever (Canis familiaris) puppies

Mark Raycroft / French Bulldog (Canis familiaris) adult and puppy

Mark Raycroft / Basset Hound (Canis familiaris) puppy

Kevin Schafer / Darwin's Fox (Pseudalopex fulvipes) portrait, in temperate rainforest, Chiloe Island, Chile, November, Critically Endangered

Kevin Schafer / Darwin's fox (Pseudalopex fulvipes) wild, Chiloe Island, Chile, Critically endangered species, November

Suzi Eszterhas / African Wild Dog (Lycaon pictus) pack attacking Warthog (Phacochoerus africanus), northern Botswana

Suzi Eszterhas / African Wild Dog (Lycaon pictus) pack attacking Warthog (Phacochoerus africanus), northern Botswana

Suzi Eszterhas / African Wild Dog (Lycaon pictus) pack attacking Warthog (Phacochoerus africanus), northern Botswana

Suzi Eszterhas / African Wild Dog (Lycaon pictus) pack attacking Warthog (Phacochoerus africanus), northern Botswana

Suzi Eszterhas / African Wild Dog (Lycaon pictus), northern Botswana

Sergey Gorshkov / Red Fox (Vulpes vulpes) yawning, Kamchatka, Russia

Konrad Wothe / Fennec Fox (Vulpes zerda) looking out of den, Libya

Donald M. Jones / Coyote (Canis latrans) six week old pups, western Montana

Yva Momatiuk & John Eastcott / Red Fox (Vulpes vulpes) hunting, Denali National Park, Alaska

Suzi Eszterhas / Bat-eared Fox (Otocyon megalotis) with thirteen day old pup, Masai Mara, Kenya

Donald M. Jones / Timber Wolf (Canis lupus) in snow, western Alberta, Canada

Donald M. Jones / Timber Wolf (Canis lupus) in snow, western Alberta, Canada

Donald M. Jones / Timber Wolf (Canis lupus) in winter, western Alberta, Canada

Donald M. Jones / Timber Wolf (Canis lupus) in winter, western Alberta, Canada

Donald M. Jones / Timber Wolf (Canis lupus) walking through snow, western Alberta, Canada

Donald M. Jones / Timber Wolf (Canis lupus), western Alberta, Canada

Donald M. Jones / Coyote (Canis latrans), western Montana

Matthias Breiter / Timber Wolf (Canis lupus) pair jumping over log, Montana

Suzi Eszterhas / African Wild Dog (Lycaon pictus) six to eight week old pup running, Okavango Delta, Botswana

Suzi Eszterhas / African Wild Dog (Lycaon pictus), Okavango Delta, Botswana

Suzi Eszterhas / African Wild Dog (Lycaon pictus) six to eight week old pup, Okavango Delta, Botswana

Yva Momatiuk & John Eastcott / Timber Wolf (Canis lupus) trio resting together, Denali National Park, Alaska

Jasper Doest / Arctic Fox (Alopex lagopus) in light snow fall, Svalbard, Norway

Jasper Doest / Gray Wolf (Canis lupus) pair in the snow, Norway

Kevin Schafer / Darwin's Zorro (Lycalopex fulvipes) a critically endangered fox, Chiloe Island, Chile

Richard Du Toit / African Wild Dog (Lycaon pictus) portrait, Chobe National Park, Botswana

Jasper Doest / Arctic Fox (Alopex lagopus) kits playing, Svalbard, Norway

Suzi Eszterhas / Bat-eared Fox (Otocyon megalotis) parent and pup, Masai Mara, Kenya

Suzi Eszterhas / Bat-eared Fox (Otocyon megalotis) pups outside of den, Masai Mara, Kenya

Suzi Eszterhas / Bat-eared Fox (Otocyon megalotis) parent with five day old pups at den entrance, Masai Mara National Reserve, Kenya

Suzi Eszterhas / Bat-eared Fox (Otocyon megalotis) portrait, Masai Mara National Reserve, Kenya

Tim Fitzharris / Gray Wolf (Canis lupus) pups in light snowfall, North America

Mitsuaki Iwago / Bat-eared Fox (Otocyon megalotis) mother and pups, Africa

Mark Raycroft / English Springer Spaniel (Canis familiaris) puppies

Mark Raycroft / Red Fox (Vulpes vulpes) portrait, Canada

Mark Raycroft / Golden Retriever (Canis familiaris) puppy running

Mark Raycroft / Golden Retriever (Canis familiaris) portrait

Mark Raycroft / Bull Terrier (Canis familiaris)

Suzi Eszterhas / Black-backed Jackal (Canis mesomelas) pup, four weeks old, peeking out of den, Masai Mara, Kenya

Sergey Gorshkov / Red Fox (Vulpes vulpes) on snow, Kamchatka, Russia

Sergey Gorshkov / Red Fox (Vulpes vulpes) smelling snow, Kamchatka, Russia

Sergey Gorshkov / Red Fox (Vulpes vulpes), Kamchatka, Russia

Thomas Mangelsen / Gray Wolf (Canis lupus) surveying the tundra, Denali National Park, Alaska

Richard Du Toit / African Wild Dog (Lycaon pictus) portrait, Moremi Wildlife Reserve, Botswana

Richard Du Toit / African Wild Dog (Lycaon pictus) pair laying in green grass of summer, endangered, Savuti, Chobe National Park, Botswana

Yva Momatiuk & John Eastcott / Gray Wolf (Canis lupus) juvenile, on colorful autumn tundra, Denali National Park, Alaska

Mark Raycroft / Australian Cattle Dog (Canis familiaris) portrait

Mark Raycroft / Australian Shepherd (Canis familiaris) in play posture

Tim Fitzharris / Gray Wolf (Canis lupus) pair standing, North America

Tim Fitzharris / Gray Wolf (canis lupus) howling, North America

Tim Fitzharris / Red Fox (Vulpes vulpes) kit, North America

Tim Fitzharris / Red Fox (Vulpes vulpes) trio of kits peeking out of their den, North America

Pete Oxford / African Wild Dog (Lycaon pictus) portrait, endangered, Africa

Mark Raycroft / Miniature Long-haired Dachshund (Canis familiaris) puppy sitting on red blanket

Mark Raycroft / Beagle (Canis familiaris) puppy pair on red blanket

Mark Raycroft / Rottweiler (Canis familiaris) male and puppy

Mark Raycroft / Cairn Terrier (Canis familiaris) puppy leaning on logs