Well, you can't hide in the restroom forever. You might as well go out and face the world. You step out of the stall. Your eye catches the mirror, though, and you realize that some other changes also happened when you ate the candy...changes you didn't notice right away.
Notably you also have beagle ears. They're long, they're floppy, and they hang down on either side of your face. You give them a gentle tug with your fingers, feeling the leather skin and the smooth brown fuzz. The tip of your nose is black, too, just like a dog's. You discover you can move your new ears up and down. This is really strange, but still kind of refreshing.
You also realize that your mouth has felt and tasted odd ever since you ate the candy. You open it up and immediately see why. For one thing, your tongue is flat like a dog's, but still short enough to fit into your (mostly) human mouth. But what really catches your eye is your teeth: most of them are the same, but your four canines are significantly longer. You touch one with your index finger. Sharp!
You stand there momentarily, feeling like your in an episode of The Twilight Zone, when a sound grabs your attention. It's a rather loud, clear squeaking sound. You look all around you but don't see anything that could be making it. You look under the sink--surely whatever makes the sound is must be close. You lift your right ear--the squeaking is from that direction! You follow the sound all the way to the farthest stall. Listening carefully, you finally look under the toilet and still see nothing, but the sound is getting closer.
There it is! Behind the toilet, in a hole, there is a tiny mouse. Wow! Your hearing must have gotten way more sensitive when your ears changed. You give a low growl and show off your cool new fangs. The mouse scurries away deeper into the wall. "Maybe this *is* going to be fun," you think, wagging your tail.