It was depicted as a donkey, as a composite creature with a horned head, long neck and a horse's body, and as a host of other forms.
[1] (The word "panther", in Greek, could be interpreted as "every wild beast", supporting the idea of a composite creature.)
In Germany in particular, the panther is often depicted in heraldry as a creature with four horns, cow's ears and a fiery red tongue.
The arms of the Worshipful Company of Dyers, however, have as supporters two panthers with red, blue, green, purple and black spots.
A panther which is all silver (argent) is seen in the coat of arms of the Austrian province of Styria (Steiermark) on green (Vert) shield.