@tabitha
This is a good question…I get so annoyed when I think a character is a human, only to find out they’re a parrot.😄
Erynne has some good ideas, but I might add a few. Depending on how your story works, you could remind readers of animal-ness by making them have different accents or cultures.
I think something I would do most would be to pay attention to details. Animals act differently then humans, even if they have similar characteristics (C.S. Lewis’s Horse and His Boy might be a good reference for horses). A cat, for example, might pay more attention to movement, stare you in the eyes when she’s angry, flick her ears if she hears something, scratch herself with her back leg, make meowy-grunting sounds instead of saying “eh,” or “yeah,” and prefer naps in sunny spots.
I think the little things make the most difference…like remembering that eye-contact is friendly among humans (at least in North America), but animals almost always take eye-contact as aggressive.
Asking your readers if you’re being clear is also a good idea. I don’t have talking animals at the moment…but one of my stories has centaurs, which is going to be a challenge because they have human attributes as well as horse characteristics.😂
"If I'm gonna break, I'll break like the dawn." -Nightbirde