I decided to tinker around on an old kid's practice first act piano. There are metal rods inside that are struck, and produce a plink/ringing sound. It is also out of tune, which makes it wonderful for producing an eerie feeling when played in a minor key.
By placing my hand over my mouth i instantly have a compressor that distorts any air or sound in my mouth. All i do then is, with my mouth open, "hoot" or yell in short sharp bursts to make it sound like a dog.
