Go outside by a tree....turn the hall light on and leave the door open.....pee your pants.....suck it up, use the toilet, you'll be just fine.
It really depends on whether you're a boy chihuahua or a girl chihuahua. If you're a girl, just squat on the floor and let your human clean it up afterwards. If you're a boy c ock a leg and pee on his shoes so that the lazy slob will go and fix the light for you.
It's a bit late for me to ask this, of course, but how did they ever train a chihuahua to use the bathroom?
Use a flashlight, or a candle, or leave the door open. Or better yet, fix the darn light.
Why don't you just use another bathroom?
Are you worried about monsters or just your aim?
use a flash light.