animalize

1. To cause (another) to behave like an animal.
2. To depict or represent in the form of an animal.

verb

To ruin utterly in character or quality: bastardize, bestialize, brutalize, canker, corrupt, debase, debauch, demoralize, deprave, pervert, stain, vitiate, warp. See clean/dirty, help/harm/harmless.

The verb has 3 meanings:

Meaning #1: represent in the form of an animal
  Synonym: animalise

Meaning #2: make brutal, unfeeling, or inhuman
  Synonyms: brutalize, brutalise, animalise

Meaning #3: become brutal or insensitive and unfeeling
  Synonyms: brutalize, brutalise, animalise