One that serves the devil in Catalan myth is called Dip, and spectral versions of these animals associated with the sound of 
One that serves the devil in Catalan myth is called Dip, and spectral versions of these animals associated with the sound of geese belong to Bran and are called the Cwn Annwn.  One that haunts Peel castle on the Isle of Mann is called the Moddey Dhoo.  One named (*) Argos died when he recognized Odysseus, and one named the Barguest leaves no footprints.  The Aztec psychopomp Xolotl is usually depicted with the head of one of these and another will kill and be killed by Tyr at Ragnorak, Garm. For 10 points, name this animal, one of which has three heads and guards Hades.
One that serves the devil in Catalan myth is called Dip, and spectral versions of these animals associated with the sound of geese belong to Bran and are called the Cwn Annwn.  
{Dog} [accept {hound}]