ululate (one of my favorites -- fun to say and it's fun to howl like a dog -- you guys* know what I mean):
verb** (used without object), ul·u·lat·ed, ul·u·lat·ing.
1. to howl, as a dog or a wolf; hoot, as an owl.
*Women may prefer to hoot like an owl over howling like a dog or wolf, but I don't know. Any votes? Mrs. Verb voted "owl."