Here are the 10 best pictures of dogs yawning in our photo tool

The guest of honor and the 2008 Westminster Best in Show winner Uno yawns at the lighting ceremony of the Empire State Building on February 9, 2009 in New York City. (Photo by Andrew H. Walker/Getty Images)

Guide dog puppy Halo yawns during a visit by Prime Minister John Key as the PM lends his support for the Red Puppy Appeal at the Royal New Zealand Foundation of the Blind National Office on April 2, 2009 in Auckland, New Zealand. The Red Puppy Appeal raises money to breed, raise, train puppies as guide dogs. (Photo by Phil Walter/Getty Images)

A dog yawns as Camilla, Duchess of Cornwall visits Mayhew Animal Home on May 12, 2010 in London, England. Mayhew Animal home was established in 1886 for the benefit of ‘The lost and starving dogs and cats of London’. The Duchess met volunteers and supporters during the visit. (Photo by Chris Jackson/WPA Pool/Getty Images)

A Springer Spaniel yawns while being shown in the Jnr Showmanship section during the 132nd Annual Westminster Kennel Club Dog Show at Madison Square Garden February 11, 2008 in New York City. The Westminster Kennel Club Dog Show is considered the most important in the United States. (Photo by Chris McGrath/Getty Images)

Harley, a dog visiting from Chino, California with his master Brian McColl, yawns as ash and steam spews from Mount Saint Helens volcano in the largest and ashiest yet in a series of growing eruptions that began last week October 5, 2004 in Mount Saint Helens National Monument, Washington. Scientists believe that magma is rising to the surface and an explosive eruption is imminent. In 1980, a huge eruption on Mount Saint Helens blew the top off the volcano and sent volcanic ash around the world. It also produced possibly the largest landslide ever recorded, wiped out an entire forest and killed 57 people. (Photo by David McNew/Getty Images)

Addison yawns as she enjoys the royal suite as she is boarded at the Chateau Poochie the luxury hotel for dogs and cats December 13, 2007 in Pompano Beach, Florida. The room is a spacious room with a designer king size sleigh bed, flat screen TV and other services. Amenities at the hotel include state-of-the art grooming services, doggie social hour, the behavioral institute as well as massages and bottled water. Other hotel features include the haute couture fashion boutique, bone booth to talk to your pet, Le jardin outdoor garden, tea cup room, senior center, salon & spa, wellness center and food from a gourmet pet chef. (Photo by Joe Raedle/Getty Images)

Tonto, a guide horse, yawns before going on a walk with his owner Shari Bernstiel, March 19, 2004 in Lansdale, Pennsylvania. Tonto, a miniature horse who went through one year of training, acts as Bernstiel’s seeing eye dog and is one of three working guide horses in the United States. (Photo by William Thomas Cain/Getty Images)

‘Nico’ the Poodle yawns during the 102nd Crufts dog show on March 11, 2005 in Birmingham, England. Over 23,000 top pedigree dogs from around the world are competing in over 2,000 individual classes for the prestigious title of ‘Best In Show’. Crufts was founded in 1891 and is the most prestigious and largest dog show in the world. (Photo by Scott Barbour/Getty Images)

A dog named ‘Scooby’ yawns while waiting with his owner in front of the Staples Center before the start of game 4 of The Stanley Cup Finals June 6, 2012 in Los Angeles, California. A win in game 4 against the New Jersey Devils would lead the Los Angeles Kings to their first championship in franchise history. (Photo by Jonathan Gibby/Getty Images)

A shi-tzu pauses for a yawn during the New York Metro Specialty Dog Show February 9, 2002 in New York City. The dog show gathering specializes in toy dog breeds. (Photo by George Best/Getty Images)