text: * by pets, assistance animals, or working animals: animal-assisted therapy
  ** by horses: equine therapy, hippotherapy
  ** by dogs: pet therapy with therapy dogs, including grief therapy dogs
  ** by cats: pet therapy with therapy cats
  * by fish: ichthyotherapy (wading with fish), aquarium therapy (watching fish)
  * by maggots: maggot therapy
  * by worms:
  ** by internal worms: helminthic therapy
  ** by leeches: leech therapy
  * by immersion: animal bath