Do not to bring spellcasting pets to the Medusa peerless! The Medusa's petrification attack can permanently remove your pet's spellcasting ability! Read the following thread on Uhall: http://vboards.stratics.com/showthread.php?t=166342
Its not permanent! It happened to my Dragon too. Just take it back in and have her petrify it again. My dragon got all its skills back plus it still has the chocolate hue.