The Bony-eared Assfish.
“The bony-eared assfish holds the record for the smallest brain-to-body weight ratio of all vertebrates.”
Rhinoceros
Bears sometimes invade my dreams, so I’ll go with da bears. Though a witchy lady once said an elk had to be my SA. How can one tell?
Common Snapping Turtle. I go about my business but if you impede my progress I can be irritable. I don’t take well to being herded.
Human.
House cat. Feed me, but only when I want it. Pet me, but only when I want it. I will sit on you only if and when it pleases me. I require total obedience from you.
If you deny me any of my wishes, I will poop in your shoes. Do it again, it’s hairball on your pillow time.
Grizzly bear.
Big, kinda ornery, like to hibernate.
People often assume that is my spirit animal, but they usually reconsider after I trample them.
Dumpster Raccoon.
Otter. Enjoying life playing and chasing fish! And always cute!
A duck. Master of water, land, and air. Ok maybe not master of land but can do ok walking around. I value versatility.
Bison: Damn near hunted to extinction 
Pushmi-pullyu. I’ll always have someone watching out for me.
Based on my level of physical activity, receptivity toward new ideas, and pet owning proclivities, it appears that my spirit animal is a rock.
Mockingbird.
I’m always pretending to be something that I’m not.
The Bat. Misunderstood, only barely capable of walking but can fly upside down and hover.
Since the revelation of this some decades ago I’ve collected a LOT of plush bats, bat statues, one bat (genus and species unknown) in a small jar of preservative and an Intermediate Horseshoe Bat preserved in urethane like an Addams family paperweight. I also have several field guides to bats and a Bat Seeker II bat detector.
Speaking as a furry, some variety of humanimal, of anthropomorph, essentially a cat-guy.
The Capybara, which is my avatar. Super chill, friendly to everyone, has incisors that can punch through concrete.
They’re a kind of fish, right?: https://www.nysun.com/foreign/in-days-before-easter-venezuelans-tuck-into/11063/
Sewer rat may taste like pumpkin pie but I’ll never know.