Welcome 2YsUR. An interesting question on the antonym of anthropomorhism. We use phrases and specific similes, such as "he was acting like an animal" or "his panther-like grace". We also say things like "The soldiers were brutalised by their experiences" to mean they were likely to behave in an inhumane way. But as for a general word to cover the imposition of non-human or animal traits onto humans, I can't think of one. Anthropomorhism is the superimposition of human (a very small - but special to us - part of the animal kingdom) characteristics onto animals, gods, and objects, effectively the rest of the universe. That is a very wide area from which to impose characteristics onto humans. There may be words to cover specific subsets such as from the gods, but again I can't think of any offhand.

Rod

PS. I presume we are discussing emotional and mental chacteristics rather than physical ones such as Bottom in A Midsummer Night's Dream