There is no specific legal training required for dog hydro trainers. However, there are various continuing education courses, trainings and certifications that they can take to learn their knowledge and skills in this field. For example, such trainings are offered by specialized dog schools, animal physiotherapists or experienced aqua trainers. It is important that a canine hydrotherapist has a good knowledge of canine anatomy, physiology, and biomechanics, as well as experience working with dogs in water.