After another face full of dog food, you spend some time just walking around on all fours sniffing around on the floor trying to figure out just what dogs get out of it. Surprisingly, it actually is kind of interesting. It doesn't seem that you can smell all that much, but it is a little neat to notice the different scent of the living room carpet versus the kitchen wood for, for example. You also notice which areas are cleaner and which ones people have been walking on with their dirty shoes. If you had a dog's sense of smell, the floor would probably be as engaging as a TV show. Speaking of which, you haven't even bothered to turn on the TV since last night. Somehow acting like a dog has kept you fully entertained for a really long time.
Anyway, back to that chew toy! You toss it all around the room with your mouth, chasing it, before pouncing down onto it and crushing nto it with your teeth. Squeeeeeeeek! You're starting to love that sound. And you're really enjoying the feel squeezing the air out of it with your mouth. No wonder dogs love these! You stop a few times to scratch yourself some more with your back legs; it still feels great to be able to do that now. After bounding through the house in a circle one more time with the toy in your mouth, you find yourself curled up on the floor again, just chewing on the toy and listening to it squeak. You feel like you could keep this dog act up for the rest of the day!
While you're still relaxing on the floor with your toy, giving it another squeak, soaking in the fun of a nice rest after all that exercise, you noticing something odd. A little twitchy feeling that you don't quite recognize. It's like there's a little muscle spasm way down at the end of your back. What could it be? You look up from your chew toy and curl yourself around a bit more to get a look. That's when you see it: the end of your spine really is twitching! There's a little inch-long nub of bone sticking out over your butt that is apparently movable.
At first, you think it looks like maybe you broke something, and the twitching stops. Then you realize how it doesn't hurt, and how it actually looks like the little nub tail that some dogs have, except on a human. The twitching starts again. But surely you haven't always had this? I mean, you've always had a little tailbone like everyone else, but why is it so much bigger and why can you move it all of a sudden for the first time in your life? Oh well, at your age, people are always showing you long videos and giving you boring health lectures about how your body is going to change, and it always does. And it's not something you would usually notice other people being able to do because they'd have pants on. It's probably nothing. You certainly don't want to do anything about it right now, because it fits in all too perfectly with your dog act! Whenever you're happy, you're going to twitch your little nub like a dog wags its tail.
You go back to chewing on the squeaky toy with a big wide smirk, glad to feel your little nub twitching away back there.