No, I’m not going crazy. Figuring out what kind of animal your character might be is a basic acting exercise familiar to theatre actors, and it can be a useful character building tool for authors also. Basically, actors use ‘animal work’ to explore the essence of a character. The trick is to progress beyond the simple representation of roaring, mewing or squeaking, beyond even the clichés – ‘wily as a fox’, ‘quiet as a mouse’ or ‘greedy as a pig’ – to an internalization which will give a fully rounded and nuanced physicality recognizable (albeit often on a subconscious level) by an audience.

So using an animal reference can be a great way of getting a quick handle on a character, either in your own mind or in the mind of your reader.  Like a form of visual shorthand.

‘With his dull brown hair, large eyes and perpetually twitching nose, Mr Doulton resembled a rather dim-witted mouse, but Hannah soon found to her cost that his personality was pure ferret, and nasty, bad-tempered ferret at that.’

Two sides to every animal 

References to animals have powerful connotations and it is these connotations (for good or bad) that can be utilized by writers and actors alike.

Take the pig, for example.  Even when used positively, there is an underlying sense of uncontrolled appetite about them that can be exploited.

‘Hannah could barely hide her laughter. The fact was that Mr Blower had all the appearance of a rather jolly pig stuffed into an expensively-tailored suit.’ 

Of course, you don’t necessarily need the full animal – you can still work from the basic pig image, but highlight certain aspects with equally powerful effect.

‘Mr Blower was a short, rotund man with little, piggy eyes and ludicrously tiny feet.’ 

or

‘Mr Blower’s hair was coarse and blonde, bristling to a peak on top of his head. His nose was snub and the corners of his mouth turned upwards in a perpetual porcine grin.’

Obviously, you need to use animal references wisely and sparingly, otherwise your play or novel will begin to resemble some form of bizarre humanoid barnyard or an exotic zoo with an Orwellian theme. The whole point is, of course, to get the writer or actor’s imagination working beyond the obvious: to look for and think about physical nuances which not only set each character apart from the others, but also give an indication of what makes them tick.