Slideshow: beautiful portraits of stray dogs in Greece

Stray dogs are a common sight in Athens, with many living in small packs in the city's various squares or near tourist spots such as the Acropolis. Most are monitored and tagged by the local authorities, receiving vaccinations and veterinary attention when needed.

The streets - which the dogs have learnt to navigate around, negotiating busy road junctions and pedestrian crossings - also provide the food, water and shelter they need whilst various charities and individuals are also involved in their welfare.

The reason for their large numbers is varied but theories have included the closure of the traditional city dog pound and the fact that keeping dogs as pets is a relatively recent phenomenon in Greece and some owners do not realise the commitment involved and release the dogs as strays.

In 2011 a stray dog from Athens was named runner up for Time magazine's animal of year after he was widely photographed siding with demonstrators and barking at riot police during the anti-austerity protests at the height of Greece's debt crisis.