You can find your answer at Article Principles and application of canine hydrotherapy

Here in the US, Pet physiotherapy or "physical therapy" is similar to humans, where knowing the diagnosis, disease course and prognosis determines what treatments are appropriate. If deemed appropriate (say for example: tendinitis/tendinosis) hydrotherapy can be a potential treatment option. However, you much take in to consideration pet preferences, and contraindications such as open wounds.