* 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