Wooly Slug-Horse

This idea came into my head while drawing some sketches of an Inkblot-style slug creature, a slug-like pack animal full of blubber and whale oil that sort of slithers along. They are sentient animals and capable of telepathic and communicating through whistling sounds made through their teeth, and can fit in surprisingly tight spaces due to their lack of bone structure, aside for the skull to protect the brain and vibrate slightly to boost telepathic signals.