Pugs might have become an inner city dog du jour in recent years, but a century ago the short-muzzled breed was a much-loved pet among the aristocracy, with Queen Victoria in Great Britain having a legendary love for pugs. German Jugendstil-inspired artist Thomas Theodor Heine painted this pug puppy in a plush single-seater in 1921. Siegfried is of course a hit on Instagram.

Back in 1894, Thomas Theodor Heine illustrated a graphic canine comedy as a bevy of dogs of diverse breeds invade the opulent Café Luitpold coffee house in Munich. At the time, Heine was an illustrator for the satirical Munich magazine "Simplicissimus," where he employed a Jugendstil graphic style popularized by the likes of Henri de Toulouse-Lautrec. Dogs were often on the menu.

This was part of a series taken by Amit Elkayam, an Israeli photographer based in New York City, of a Great Dane named Hendrix (after Jimi Hendrix) who lives in New York with its owner, Kristina Justice. As "The New Yorker" magazine wrote of the series: "Hendrix takes on an almost human quality ... gathering to blow out candles on a birthday cake or primping for a night out."

The Russian Tsar Catherine the Great was also a great dog lover, especially of Italian greyhounds, with this companion canine (said to be called Zemira) allegedly her favorite. It was created in 1766 by the iconic German sculptor Johann Joachim Kändler — the most important modeler for the leading Meissen porcelain manufactory — based on a drawing sent to him from Moscow.

In Greek mythology, Cerberus is the three-headed hound from hell that guards the entrance to the Hades underworld. In a bid for immortality, Hercules manages to subdue and kidnaps the fierce, multi-headed canine for a night before returning him to the gates of hell. The classical terracotta sculpture by Roman Anton Boos is from 1779 and helped establish the German artist's growing artistic renown.

This work painted in 1850-60 in Kingston upon Hull by the English artist Richard Dodd Widdas, and styled after another work by French portrait and animal painter, Alfred de Dreux (also known for "Pug Dog in an Armchair"), shows how dogs have also often reflected the class position of their owners.

The Dutch sculptor Hubert Gerhard created this bronze over 400 years ago in 1589. It depicts a hunting dog that might be related to a Weimaraner, a breed traditionally used by European royalty to hunt game. Though it was especially embraced in the early 1800s by the German aristocracy to hunt deer, wolves or boars, the breed is said to date to the 13th century and is related to the Bloodhound.

This early 1869 photograph of a man with a svelte dog in Nice, in what was then Italy, depicts August Sabac el Cher, an Afro-German who was "given" to Prince Albert of Prussia when he was in Egypt as a boy. Taken by Numa Blanc, official photographer of the court of Wilhelm I, we might assume that August was enjoying the company of a Borzoi, or Russian wolfhound, then popular with the royals.

UK Prime Minister Boris Johnson's new dog moved into Downing Street this week, after being adopted from a pet shelter. The Jack Russell-cross pup's name is called Dilyn, which is Welsh for "follow" — a tip of the hat to the part of the UK where the 15-week-old puppy was born.

Russian President Vladimir Putin was gifted an alabai puppy called Verney by Turkmenistan President Berdymukhammedov (l) in 2017. Putin is a well-known dog lover, but has been shown with a host of other creatures, from polar bears to Siberian tigers. "He knows that they are great for photo opportunities," political science professor Burdett Loomis once told the Washington Post.

But another of Putin's dogs, the black lab Koni, worked against him in 2007. The Russian leader let the hound wander around during a meeting with German Chancellor Angela Merkel. "The dog does not bother you, does she? She's a friendly dog and I'm sure she will behave herself," Putin said during the talk. A true faux pas as the German chancellor is terrified of dogs after being bitten in 1995.

A real pro at making the most of photographic moments is former US President Barack Obama. The charismatic leader grabbed people's attention at nearly any event, but the Obama family's dog, Bo, was also known to steal the show in the media.

Former US President George W. Bush's terrier Barney was famous enough to have have his own page on the White House's website. US media often showed Barney (here, in a more somber image) racing across the White House lawn, with the former president smiling broadly as he tried to keep up with his pet.

Former German Chancellor Gerhard Schröder, shown with his then wife and likewise politician Doris Schröder-Köpf, made for a pretty family back in 2003 along with border terrier Holly. Holly, once known as the "First Dog," was with the family for 14 years, but died of cancer in 2017, with Doris reporting the passing on Facebook.

French President Emmanuel Macron is known to ease his woes through the comfort of his dog Nemo, shown here in 2017. Like Boris Johnson, Macron acquired his Labrador-Griffon cross dog from an animal shelter. The name is a tribute to Captain Nemo, commander of the Nautilus submarine in the Jules Verne classic "Twenty Thousand Leagues Under the Sea" — Macron is reportedly a fan of the book.

Queen Elizabeth II is one of the most famous people in the world, but nearly equally famous are the dogs that surrounded her through much of her royal life. The corgi breed has always been dear to her heart, as the then Princess received her first Pembroke Welsh Corgi, Susan, on her 18th birthday. But the Queen (shown here in 1998) also had other dogs, including cocker spaniels and dorgis.