They’re not animal-like feral in mind but these are the forms three of my main shadow beasts have from left to right
Chadwick: Sphinx-like form. The smallest but also the strongest due to magic affinity
Cak: Bat-like form with her tail still part of it. No legs.
Kim: Large mix of horse and German Shepherd, retains his blade-like legs. The largest of the trio and strongest defense.