A woman looks at photographs of dogs to choose a pet to rent at Puppy The World on January 24, 2009 in Tokyo, Japan. Rent-a-dog is becoming increasingly popular amongst people who love dogs but are unable to look after a pet full time due to limited living space or long working hours. Customers pay the dog-rental outlet around 2500 yen (32.5 USD) for an hour, and usually take their rented pet for a walk along the nearby beach. (Photo by Junko Kimura/Getty Images)

At first, British photographer Martin Usborne just wanted to do some reporting on people who leave their dogs locked up in cars. But as he went around scouring parking lots, “making barking noises to try and awaken sleeping dogs that were not actually there,” his project took on a new artistic direction. “The Silence of Dogs in Cars” was inspired by a “childhood memory of waiting in a car whilst his parents were shopping in a supermarket, and the youthful fear that they would not return.”

In a photo taken on August 30, 2014 a man brushes his dog as he waits to take part in a competition at a dog show in Seoul. Some 2000 dogs took part in the three-day show organised by the Korea Kennel Federation which was celebrating its 58th anniversary. Dog ownership in South Korea is a growing industry widely reported to have passed 10 million in 2013, with private expenditure on pet supplies increasing some 14 percent per year since 2000, according to a report by the Nonghyup Economic Research Institute. (Photo by Ed Jones/AFP Photo)

A girl allows a butterfly to be placed on her nose at the Sensational Butterflies exhibition at the Natural History Museum on April 6, 2011 in London, England. The exhibition is divided up into five sensory zones exploring how butterflies see, hear, taste, smell and touch. The display containing hundreds of butterflies runs from April 12 to September 11, 2011. (Photo by Peter Macdiarmid/Getty Images)

German photographer Tanja Brandt has created a series which captures the absolutely heart-breaking friendship between Ingo, her two-year-old German Shepherd, and a tiny owl called Napoleon. "Ingo is not always the calmest dog, however when he is around the birds, and particularly Napoleon, he is very soft and gentle", said the photographer. "He seems very at peace with them".