- Owned by 32 out of 44 presidents (73%), dogs are the most popular pet.
- Donald Trump was the first president since William McKinley to not own a dog (115 years).
- James K. Polk and Donald Trump were the only presidents to not own a pet.
- Andrew Johnson's only pets were some White House mice he started to care for during his impeachment proceedings.
- Theodore Roosevelt had the most diverse pets with 14 different types, including a black bear, a badger, a garter snake, and a laughing hyena.
- Not one, but two presidents had pet alligators - John Quincy Adams and Herbert Hoover.
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