Tentrax
From Tardis Wiki, the free Doctor Who reference
A Tentrax is a creature from somewhere in the Mutter's Spiral that appears as a horned reptile with green plates for skin and claws. It is noted for its cruelty, which is why the Daleks captured one. The planned to isolate this quality and apply it to a new breed of Daleks. (DWM: The Dogs of Doom)