Dragons and Elephants
Dragons and elephants seem to have a major beef with each other.
At least, there are many illustrations in medieval illuminated manuscripts and bestiaries documenting the ancient hatred between fire-breathing dragons and their natural enemy, elephants.
According to these depictions, dragons like to hide near paths so they can ambush and then suffocate elephants with their tails. Because of this threat, elephants, only capable of breeding once in their lives, give birth in water, preferably near the mandrake plant, a potent elephant aphrodisiac.
Apparently, dragons are also repelled by the sweet breath of panthers and annoyed by their roars. They are afraid of the peridexion trees which protect doves.