garfield
Garfield is a cartoon cat. James Garfield was the 20th US president.
The president and his family do not have a cat; they have a dog, whose name is Bo.
Garfield is both a cartoon cat and the last name of the 20th US President.
no
Garfield is a cartoon cat. James Garfield was the 20th US president.
President Obama
President Bill Clinton had a cat in the white house.
There is a cartoon cat named Garfield and James Garfield was the 20th US president. Therefore, Garfield is the answer.
garfield
Garfield (The president, not the cat)
Not just one president owned a cat. Lincoln owned Tabby the first cat owned by a president, Theodore Roosevelt had two, Calvin Coolidge had three, some even had exotic cats, i.e. a tiger and lion cubs.
Because they wanted cat socks :)