Adult Harly Danes look like [this], but Fenris has [uncropped ears] and his patches are grey.
Great Danes are [big], [big], [big], [bloody big] dogs.
Fenris is a very intelligent dog but cannot speak or communicate in any other way beyond the normal ways a dog expresses itself.
He has limited conscious defence against telepathy and can leave a psionic attacker thinking of rabbits for several hours.
Fenris is a stately, dignified and [patient] dog who likes everyone.