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

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

Wild Wonders of Europe / O. Haarberg / Wild pansy (Viola tricolor) flower, Stockholm Archipelago, Sweden, June 2009

Petra Wegner / Jack Russell Terrier, puppy bitch, 4 month, sitting with back legs splayed

Jane Burton / Basset Hound, sleeping upside down with ears spread

Rolf Nussbaumer / Tricoloured heron {Egretta tricolor} on mangrove, Sanibel Is, Florida, USA

Juan Carlos Munoz / Tricoloured Heron (Egretta tricolor) silhouetted against beach. Everglades National Park, Florida, USA, February.

George Sanker / Tricolored heron (Egretta tricolor) hunting in water, Everglades National Park, Florida, USA, March

LYNN M. STONE / Beagle Hound male portrait against flowers, USA

LYNN M. STONE / Tricolored Heron (Egretta tricolor) wading through floating bed of plants in freshwater marsh. Lakeland, Florida, USA, November.

LYNN M. STONE / Tricolored Heron (Egretta tricolor) in breeding plumage. Osecola County, Florida, USA, March.

LYNN M. STONE / Tricolored Heron (Egretta tricolor) in breeding plumage. Osecola County, Florida, USA, March.

LYNN M. STONE / Tricolored Heron (Egretta tricolor) in breeding plumage, standing in saltwater lagoon. St. Petersburg, Florida, USA, April.

Barry Mansell / Tricolored Heron (Egretta tricolor) perched, Everglades National Park, South Florida, USA, April

Barry Mansell / Tricolor Heron (Egretta tricolor) juvenile perched, Everglades National Park, South Florida, USA, May

Petra Wegner / Tricolour Cavalier King Charles Spaniel lying on floor in corridor

Petra Wegner / Tricolour Cavalier King Charles Spaniel lying on carpet in corridor

Petra Wegner / Two Cavalier King Charles Spaniels, sitting on beach chair, tricolour and blenheim

Petra Wegner / Four Cavalier King Charles Spaniels, tricolour sitting on deckchair, black-and-tan lying on ground, blenheim on chair and ruby in paddling pool

Petra Wegner / Four Cavalier King Charles Spaniels, tricolour sitting on deckchair, black-and-tan lying on ground, blenheim on chair and ruby in paddling pool

Petra Wegner / Four Cavalier King Charles Spaniels, tricolour sitting on deckchair, black-and-tan lying on ground, blenheim on chair and ruby in paddling pool

Petra Wegner / Female tricolour Cavalier King Charles Spaniel having teeth brushed, model released

Petra Wegner / Female tricolour Cavalier King Charles Spaniel, having teeth brushed, model released

Petra Wegner / Two Cavalier king charles spaniels, blenheim one standing on hind legs against spade as if digging with a tricolour one lying on sand near toys on beach, Texel Island, Netherlands

Petra Wegner / Two Cavalier king charles spaniels sitting on beach by toys, one blenheim the other tricolour, Texel Island, Netherlands

Petra Wegner / Papillon / Butterfly dog / Continental toy spaniel bitch sitting, 8 months

Petra Wegner / Papillon / Butterfly dog / Continental toy spaniel bitch, head portrait, 8 months

Petra Wegner / Papillon / Butterfly dog / Continental toy spaniel bitch sitting, 8 months

Petra Wegner / Male Papillon / Butterfly dog / Continental toy spaniel lying down, 8 months

Petra Wegner / Female Papillon / Butterfly dog / Continental toy spaniel, 8 months

Petra Wegner / Female Papillon / Butterfly dog / Continental toy spaniel sitting, 8 months

Petra Wegner / Female Papillon / Butterfly dog / Continental toy spaniel lying down, 8 months

Petra Wegner / Male Papillon / Butterfly dog / Continental toy spaniel sitting, 8 months

Petra Wegner / Australian shepherd, black-tricolour, puppy, 7 weeks, sitting in basket

Petra Wegner / Australian shepherd, black-tricolour, puppy, 7 weeks

Petra Wegner / Australian shepherd, black-tricolour, puppy, 7 weeks

Petra Wegner / Australian shepherd, black-tricolour, puppy, 7 weeks, lying on grass

Ernie Janes / Wild pansies (Viola tricolor) flowering, UK, June

Bernard Castelein / Wild pansy flower (Viola tricolor), Klein Schietveld, Brasschaat, Belgium, April

B&S Draker / Tricolored Heron (Egretta tricolor) stalking fish in shallow water. Sinton, Corpus Christi, Coastal Bend, Texas, USA, May.

Ann & Steve Toon / Hearstease pansy (Viola tricolor) South Walney Nature Reserve, near Barrow, Cumbria, UK, August

LYNN M. STONE / Tricolored Heron (Egretta tricolor) in non-breeding plumage. Tampa Bay, Florida, USA, November.

LYNN M. STONE / Tricolored Heron (Egretta tricolor) silhouetted at dawn. Dunedin, Florida, USA, November.

LYNN M. STONE / Tricolored Heron (Egretta tricolor) silhouetted at dawn. Dunedin, Florida, USA, November.

Florian Möllers / Heartsease / Wild pansy (Viola tricolor), flowers, Berlin, Germany, May

Konstantin Mikhailov / Pansy (Viola tricolor) cultivated garden flower

LYNN M. STONE / Tricolored Heron (Egretta tricolor) stalking in tidal shallows for fish, Tampa Bay, Florida, USA

Pete Oxford / Red-backed Hawk (Buteo polyosoma polyosoma) perched on post. Keppel Island. Off north coast of West Falkland. Falkland Islands

Marie Read / Tricolored Heron (Egretta tricolor) in flight, palmettos in background, Orlando, Florida, USA

Philippe Clement / Heartsease / Wild pansy (Viola tricolor) flower, Belgium

Philippe Clement / Heartsease / Wild pansy (Viola tricolor) in flower, Belgium

Tim Laman / Tricoloured heron (Egretta tricolor) bringing food to its chick in nest on a Mangrove island, Alafia Banks Bird Sanctuary, Sunken Island, Tampa Bay, Florida, USA.

Tim Laman / Tricoloured heron (Egretta tricolor) bringing food to its chick in nest on Mangrove island, Alafia Banks Bird Sanctuary, Sunken Island, Tampa Bay, Florida, USA.

Tim Laman / Tricolored Heron (Egretta tricolor) perched in mangrove tree, Alafia Banks Bird Sanctuary, Tampa Bay, Florida, USA.

Tim Laman / Juvenile Tricolored Heron (Egretta tricolor) perched in mangrove tree, Alafia Banks Bird Sanctuary, Tampa Bay, Florida, USA..

Shattil & Rozinski / Tricoloured heron (Egretta tricolor) walking through lagoon water, Southern USA

Roy Mangersnes / Red-backed buzzard / hawk (Buteo polyosoma) in the Andean mountains near Valle Nevado, Santiago, Chile. October.

Petra Wegner / Jack Russell Terrier, puppy, 4 month, head portrait

Petra Wegner / Appenzell Mountain Dog, lying down

Petra Wegner / Mixed Breed Dog, bitch, sitting

Rob Tilley / Tricoloured Heron {Egretta tricolor} Everglades NP, Florida, USA

Petra Wegner / Two Entlebucher Mountain Dogs lying down

Petra Wegner / Entlebucher Mountain Dog standing

Petra Wegner / Two Entlebucher Mountain Dogs sitting together

Petra Wegner / Tricolor Cavalier King Charles Spaniel playing in torn up paper

Petra Wegner / Great Swiss Mountain Dog puppy, 14 weeks, sitting portrait

Petra Wegner / Entlebucher Mountain Dog standing

Petra Wegner / Great Swiss Mountain Dog puppy, 14 weeks, sitting down

Petra Wegner / Great Swiss Mountain Dog puppy, 14 weeks, lying down and gnawing on its paw.

Brian Lightfoot / Wild pansy {Viola tricolor} and Field pansy {Viola arvensis} flowering in field, Scotland, UK

Eric Baccega / Hunting show with pack of French Tricolore Hounds (Canis familiaris) at the Chateau de la Bourbansais, Brittany, France

Eric Baccega / Olivier de LORGERIL, Comte de la Bourbansais, and his pack of French Tricolore Hound at the Chateau de la Bourbansais, Brittany, France 2007

Eric Baccega / Hunting show with pack of French Tricolore Hounds at the Chateau de la Bourbansais, Brittany, France

Doug Wechsler / Tricoloured heron {Egretta tricolor} in saltmarsh, Gulf Coast, Texas, USA

John Cancalosi / Tricolored Heron {Egretta tricolor} on nest with egg, Louisiana, USA

Jane Burton / Basset Hound bitch pup, 18 weeks old, lying down

Jane Burton / Emily (13) telling tricolour Border Collie pup to sit, wait for dinner

Jane Burton / Lakeland Terrier x Border Collie, pup sisters, 1-year juvenile playing with 6-week puppy

Jane Burton / Two tricolour Border Collies, 7-week pups laying down together

Jane Burton / Blue tricolour Border Collie, 7-week pup, portrait with blue rope knot toy

Jane Burton / Sable Border collie, 3-day pup sleeping

Jane Burton / Lakeland Terrier x Border Collie, 1-day puppy, sleeping portrait

Jane Burton / Border Collie x (Terrier x Shih-Tzu) 7-month bitch, rolling over submissively on back

Jane Burton / Blue tricolour Border Collie, bitch suckling her 7-day pups

Jane Burton / Jack Russell Terrier-cross, 14-week puppy urinating

Jane Burton / Portrait of two tricolour Border Collie pups sitting

Jane Burton / Pregnant blue tricolour Border Collie bitch, a week before giving birth to eight pups

Jane Burton / Lakeland terrier x border collie, 7-week pup tugging shoelace

Jane Burton / Mixed breed dog guarding food from puppy and growling.

Jane Burton / Border Collie x New Zealand Huntaway pup, play-bowing with toy, 18 weeks old

Jane Burton / Sable Border Collie suckling her six new born pups

Jane Burton / Black and tan Cavalier King Charles Spaniel sitting next to tricolour pup.

Jane Burton / Blue-fawn Saluki Lurcher bitch, 1 year old, snarling at Border Collie x Huntaway bitch, 6 months old

Jane Burton / Lakeland Terrier x Border Collie, 6-week puppy, laying portrait

Jane Burton / Woman showing boy how to open a pup's mouth and look at its tongue and teeth