1/ In How Democracies Die, in many ways an admirable book, Levitsky & Ziblatt inform us that Donald Trump has broken the longstanding norm of Presidential pet-keeping. (According to Wikipedia, James Polk also had no known pets.)
Andrew Jackson's fighting cocks, and Calvin Coolidge's goat.
James Buchanan outdid the meme with an actual eagle,
while Andrew Johnson fed two white mice that he found in his bedroom.
Teddy Roosevelt called his garter snake "Emily Spinach" (or perhaps his children did.)
Coolidge had a raccoon, as well, and Kennedy hamsters.
Sweetlips, Vulcan, and Drunkard, three of Washington's hounds,
and William McKinley called his yellow-headed parrot The Washington Post.