The supplementary book Zootopia: The Essential Guide notes that Judy's mother, Bonnie, can always tell if her children feel bad by the way their ears droop. The same can be seen with the other animals. Judy, who is a rabbit, has ears that go down when she's sad or annoyed while staying straight up when she's happy.In My Friends Tigger & Pooh, there's also Holly, a young reindeer. The Many Adventures of Winnie the Pooh: Roo does it when he's sad.All the animals in Bambi, Bambi and Thumper in particular.
She's a stuffed rabbit, but all of the stuffed characters on the series generally behave fully anthropomorphically. Lulla has these on Suzy's Zoo: Daisuki! Witzy.Holo from Spice and Wolf, whose ears twitch when she hears something interesting and sag when she is feeling sad.In Utawarerumono, the people have expressive tails as well as expressive ears.Being the first of those foot-long eared elf varieties helped. Expressive ears were found on Deedlit in Record of Lodoss War.It's rare for a long-eared character not to have Expressive Ears. Elves and other long-eared folk, or even folk with anything approximating long ears, in anime often have expressive ears.Many Pokémon have expressive ears, including Pikachu and Meowth.A rabbit signalman on the aircraft carrier doesn't need semaphore flags, because he can signal with his ears! A variant in early anime film Momotaro's Sea Eagles.
Any of the elves from Delicious in Dungeon.