Donald Trump could become the first U.S. president in decades who doesn't have a pet dog – or any pets for that matter – in the White House. Other presidents in the past have had a least one dog, while many had several.

The last U.S. president who did not own a dog in office was William McKinley, but he did own several other animals, including roosters and a Mexican parrot named “Washington Post,” according to the Presidential Pet Museum.

Andrew Johnson also did not bring any pets into the White House, but he apparently had a habit of feeding mice he saw running around the office, according to the Huffington Post. Martin Van Buren didn’t have pets in the office, as well, but he did own two tiger cubs that Congress made him send to the zoo, according to the Presidential Pet Museum.

In contrast, John F. Kennedy had 21 pets during his presidency, including a horse named Sardar and hamsters named Debbie and Billie, according to the Presidential Pet Museum; Theodore Roosevelt had Josiah the badger and Peter, the rabbit.

Most recently, the Obamas had two Portuguese water dogs named Sunny and Bo; President George W Bush had two terriers and a spaniel – as well as his longhorn cow, Ofelia – and President Bill Clinton had a labrador named Buddy.

Although it remains unclear if Trump dislikes animals, it is still too early to tell whether he'd bring a pet into the White House -- he's currently in his first 100 days in office.

Trump almost did have a pet. Philanthropist Lois Pope initially offered Trump a Goldendoodle as the first dog, but she ended up keeping it for herself after falling in love with the animal, the Palm Beach Daily News reported.