Nick Hawkins / Chum salmon (Oncorhynchus keta) migrate up a small river near Bella Bella, British Columbia, Canada. September

Lynn M Stone / West Highland Terriers in snow, Vernon, Connecticut, USA

Mark Taylor / Red toy poodle looking up at camera an sticking out tongue.

Mark Taylor / Liver Flatcoated Retriever puppy, 6 weeks, with two baby Guinea pigs. NOT AVAILABLE FOR BOOK USE

Mark Taylor / Ginger kitten leaping towards a Pug puppy. Digital composite. NOT AVAILABLE FOR BOOK USE

Bruno DAmicis,Bruno D'Amicis / Wolf (Canis lupus) approaches a small herd of Red deer (Cervus elephas) in snow, Abruzzo, Italy. Highly commended in the Mammals category of the GDT Competition 2013

Petra Wegner,Petra Wegner / Cavalier King Charles Spaniel puppies aged 7 weeks, with tricolour and blenheim colouration, on hay bale in straw

Petra Wegner,Petra Wegner / Cavalier King Charles Spaniel puppies aged 7 weeks with tricolour and blenheim colouration, in basket in straw

Petra Wegner / Cavalier King Charles Spaniel, puppy aged 7 weeks with blenheim colouration, resting on hay bale in straw

Petra Wegner,Petra Wegner / Cavalier King Charles Spaniel, bitch with black-and-tan coat

Petra Wegner,Petra Wegner / Cavalier King Charles Spaniel, male with ruby coat

Lynn M Stone / Pug dog portrait

Yves Lanceau / Lowchen / Little Lion dog, black and white, partially shaved, portrait in garden, France

Yves Lanceau / Maltese dog, male with hair in curlers

Petra Wegner / Cavalier King Charles Spaniel, ruby, running out of the sea wearing a lifejacket / life vest.

Petra Wegner / Cavalier King Charles Spaniel, puppy, black-and-tan, 6 weeks, sitting on grass, wearing collar.

Petra Wegner / Chihuahuas, longhaired, two puppies, 9 weeks, sitting in a straw basket

Petra Wegner / Chihuahua, longhaired puppy, 9 weeks, standing portrait.

Petra Wegner / Chihuahua, longhaired puppy, 9 weeks, sitting portrait.

Petra Wegner / Cavalier King Charles Spaniel, blenheim puppy, 4 1/2 months, standing.

Petra Wegner / Cavalier King Charles Spaniels, ruby and tricolour, sitting in snow.

Petra Wegner / Cavalier King Charles Spaniel, tricolour, getting teeth brushed with oral cleaner, model released

Petra Wegner / Miniature Wirehaired Dachshund sitting.

Petra Wegner / Italian Greyhounds, bitch and puppies, 8 weeks / Piccolo Levriero Italiano.

Petra Wegner / Kooikerhondje / Small Dutch Waterfowl Dog portrait.

Petra Wegner / Dobermann Pinscher puppies, 5 weeks, feeding from bowl.

Petra Wegner / Chihuahua, longhaired puppy, 12 weeks.

Petra Wegner / Chihuahua, longhaired, with trophy sitting on red cushion.

Petra Wegner / Chinese Crested Dog, powderpuff puppy, 9 weeks.

Petra Wegner / Chinese Crested Dog, hairless bitch with puppy, male, 4 months.

Petra Wegner / Cavalier King Charles Spaniel puppy, tricolour, 5 weeks.

Petra Wegner / Mixed Breed puppy, 12 weeks / Pug crossbred, sitting on small sofa with reindeer toy.

Petra Wegner / Small Munsterlander puppy, 7 weeks, against white background.

Petra Wegner / Three Cavalier King Charles Spaniels, tricolour and blenheim sitting on beach chair, ruby on deckchair. Property released.

Lynn M Stone / Golden Retriever puppy walking through snow by a small twig with berries. Big Rock, Illinois, USA, February.

Mark Taylor / Yorkshire Terrier, with Netherland-cross rabbit. NOT AVAILABLE FOR BOOK USE

Mark Taylor / Red toy Poodle dog, and Ragdoll-cross kitten, 5 weeks. NOT AVAILABLE FOR BOOK USE

Mark Taylor / Yorkshire Terrier, lying with chin on the floor.

Mark Taylor / Fawn Pug puppy, 8 weeks, wearing a Father Christmas hat.

David Welling / Utah Prairie Dog (Cynomys parvidens) standing on watch outside their burrow. Bryce Canyon National Park, Utah, USA, August.

Yves Lanceau / Domestic dog, Mongrel, studio portrait

Yves Lanceau / Domestic dog, Pekingese, studio portrait

Aflo / Portrait of young girl holding white Chihuahua puppy

Aflo / Group portrait of three Chihuahua puppies, sitting on white towels

Mark Taylor / West Highland White Terrier leaping.

Mark Taylor / West Highland White Terrier sitting.

Jane Burton / West Highland White Terrier sitting.

Yves Lanceau / Dog, Jack Russell Terrier, three puppies with pumpkin