All the presidents' pups

A recent Virginia Commonwealth University study said dogs in the work place actually reduce stress and create a better work environment for employees.

Here's a look at some of the dogs belonging to both past and present Presidents of the United States of America.

President Barack Obama plays with Bo, the Obama family dog, aboard Air Force One during a flight to Hawaii.

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Bo, a Portuguese water dog and the family pet of the Obamas, is seen in the Rose Garden of the White House in Washington, Monday, June 13, 2011.

Pictures: Get to know Bo
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In this Feb. 29, 2008 photo, President George W. Bush and his dog Barney steps from Air Force One after arriving in Waco, Texas.

Barney was featured in the "BarneyCam" videos released at the holidays.

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President Bush and first lady, Laura, carry their dogs, Barney and Miss Beazley, respectively, before departing from Waco, Texas, on Marine One on their way to their ranch in Crawford for the remainder of the holiday, Monday, Dec. 26, 2005. The first couple is scheduled to return to Washington after the New Year's holiday.

WATCH: "BarneyCam" 2007

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President Clinton returns to White House with his dog Buddy, March 22, 1999, after spending the night at Camp David.

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President Clinton attempts to introduce his dog Buddy to his cat Socks during an impromptu meeting after returning from a visit to the Department of Education, Tueday, Jan. 6, 1998. The meeting, outside the Oval Office, apparently didn't go well. Socks, hair raised high, stood his ground until Clinton and Buddy made their exit to the Oval Office.

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Pres. George H. W. Bush and First Lady Barbara Bush are greeted at the White House by their dogs Ranger and Millie, Tuesday, Nov. 6, 1990, Washington, D.C.

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President Franklin D. Roosevelt always has time to pet Fala, his Scottish terrier, seen here in 1939.

More about Fala from the FDR Presidential Library
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Former president Lyndon B. Johnson and his wife, Lady Bird, pose with their dog Yuki to mark their 38th wedding anniversary at their ranch and home in Stonewall, Texas, in this Nov. 17, 1972 photo.

More from the Lyndon Baines Johnson Library and Museum
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U.S. President Lyndon B. Johnson holds his dog "Her" by the ears as White House visitors look on, April 27, 1964, on the White House lawn, Washington, D.C. At left is President Johnson's other dog, "Him." This picture raised criticism from dog lovers.

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Vice President Richard Nixon is seen with his dog "Checkers," at his home in Spring Valley neighborhood of Washington, DC., on July 2, 1959.

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U.S. President Nixon pats the head of his Irish Setter pet King Timahoe as he walks from his office in the Executive Office building to the White House in Washington, D.C., on April 30, 1970. White House electrician Traphes Bryant holds back the other first family pets Pasha, a Yorkshire Terrier, and Vickie, a miniature French Poodle.

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First lady Nancy Reagan cradles the Reagans' pet, a King Charles spaniel named Rex, as she and President Reagan stroll along the White House South lawn in this December, 1986 photo.

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President Ronald Reagan and Mrs. Nancy Reagan walk toward the White House with their dog "Lucky," shortly after returning from a weekend at the presidential retreat at Camp David on Sunday, Jan. 6, 1985.

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President Jimmy Carter and Rosalynn Carter play with their dog "Grits" on the south lawn of the White House in Washington, D.C., after returning from church on Sunday, August 6,1978.

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AP Photo/White House,Courtesy Gerald R. Ford Library, David Hume Kennerly

In this White House file photograph provided courtesy of the Gerald R. Ford Library, President Gerald Ford, center, is seen as he confers with Secretary of State Henry Kissinger, left, and National Security Advisor Brent Scowcroft in the Oval Office of the White House in Washington, Oct. 8, 1974. Ford's golden retriever, Liberty, is in the foreground.

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