Animals play a significant role in Bringing Up Baby, adding absurdity to the comic situations and its theme of
crazed infatuation. When we first meet him, palaeontologist David Huxley (Grant) is preparing to marry his co-worker Alice Swallow (Walker). Alice, we learn, is a rational, no-nonsense woman who sees marriage as a convenient and rational transaction rather than as an expression of love. As the film opens, David and Alice are putting the final touches on a brontosaurus skeleton that he has been working on for five years. The skeleton seems to be a symbol of the couple's relationship - dry, brittle, tenuous, old and, most importantly, dead.
Enter Susan Vance (Hepburn), whose wild anarchic nature is just what the doctor ordered. She seems, on the surface, hair-brained - and this may be true - but her ditziness is the result of being absolutely, utterly, ridiculously head-over-heals in love (at first sight, as is the case with most l'amour fou scenarios) with David and doing whatever she can to sabotage his plans to marry Alice. Susan's leopard, named Baby, is the symbol of her love for David, for the moment the leopard lays its eyes on him, it is instantly affectionate and follows him around, just as Susan does. Jittery David is, of course, terrified of the beast and all that it represents.
The leopard becomes an increasingly useful symbol as the film continues. At her aunt's estate in Connecticut, Susan releases another leopard its cage, thinking it is Baby captured by zoo officials when in fact it is a rogue leopard from the circus on its way to be gassed after attacking someone. With two leopards on the loose, the analogy becomes unmistakable - the wild leopard that Susan releases is David's libido, free at last after being repressed for so long in a loveless relationship. Indeed, towards the end of the film, when the wild leopard traps the host of characters in the local jail, it is nervous, terrified David who steps up and boldly saves the day.
This I suppose is just one way of reading and enjoying a film like Bringing Up Baby. i think it's interesting that the film announces its interested in exploring psychoanalysis with the inclusion of a character who is a Freudian therapist (Dr Lehman played by Fritz Feld). Psychoanalysis was, of course, very popular among Hollywood screenwriters between the 30s and 50s who adopted all manner of coded symbols for sex after Joseph Breen's Production Code so tightly reasserted control over what could and couldn't be represented on screen. But the fact that Dr Lehman's diagnoses are so far off tells us that the science of the mind is no match for the power of l'amour fou, which turns men and women into wild, irrational carnal beasts.
