Graham Eaton,Graham Eaton / Dog chasing and disturbing a flock of Knot (Calidris canutus) on a beach, Hoylake, Wirral

Norbert Wu / Sam and Ange walking each other, Golden and Yellow Labrador Retriever (Canis familiaris) mix, Carmel, California

David Woodfall / Kevin Whales picking up litter with home made cart whilst taking dog for a walk. Jaywick, Essex, England, UK, December.

Ashley Cooper / Golden retriever dog running through Bluebells, Jiffy Knotts wood, Lake District, England, UK. May.

Ashley Cooper / Golden retriever dog running through Bluebells, Jiffy Knotts wood, Lake District, England, UK. May.

Ashley Cooper / Women walking the dog in heavy snow near Ambleside, England, UK. March 2006

Vincent Grafhorst / African Wild Dog (Lycaon pictus) in salt pan, Nxai Pan National Park, Botswana

Aflo / Shiba inu on walk with owners in park with autumn leaves on ground

Aflo / Shiba inu on walk with owners in park with autumn leaves on ground.

Mark Raycroft / German Shepherd (Canis familiaris) walking through snow

Mark Raycroft / English Bulldog (Canis familiaris) carrying a container

Ernie Janes / Dog walkers walking along The Wash in evening low tide, Norfolk, UK August 2013