They can be.
The Kennedys' canary, named Robin, was buried in the Rose Garden of the White House, for instance.
Franklin Roosevelt's dog Fala was buried next to where he is buried in Hyde Park, NY.
yes,pets were allowed in the White House.
no. he didn't have any pets.
In the sentence, 'Families bring their pets' toys to the White House.', the possessive noun is pets', showing that the toys belong to the pets.Note: If the 'white house' refers to the home of the US President, it is a proper noun, the name of a specific building, and should be capitalized. If the 'white house' is any white house in any town or neighborhood, it is a common noun.
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at the white house
a parrot
President Taft had three pets-- two cows and a dog. The cows were Pauline Wayne and Mooly Wooly, and the dog was named Caruso. (President Taft was the last president to keep cows on the White House grounds.)
YES
yes
yes he had horses in the White House
Certainly not as a rule- the VP has his own house where he can keep any pets he brings to Washington.
The first president to have a bird as one of his pets in the White House was William McKinley.