For Referring Vets and Physiotherapists

The following topics will provide vets and other animal professionals with information relating to Canine Hydrotherapy. The information will assist in all aspects of Canine Hydrotherapy but if you feel there is something missing then please do let NARCH know.


Registered Canine Hydrotherapists (RCHs) are required to obtain either a letter of referral, or a signed form giving permission to treat with hydrotherapy, from the animal's veterinary surgeon. No dog will receive hydrotherapy treatment without this.

Clients may contact hydrotherapy centres direct but in every case, even for a 'fitness' swim, they will be informed that their vet will be contacted for background information and to obtain permission for hydrotherapy treatment.

In cases where there are first opinion and referral vet(s) and/or physiotherapists involved in the animal's care, all parties will be contacted for clinical histories and reports. This is to ensure that the hydrotherapist has a complete picture of the animal's condition, behaviour, clinical history and any cautions or contraindications for hydrotherapy.

It will often be the veterinary physiotherapist who has referred for hydrotherapy and they will normally provide a summary report and plan for the hydrotherapist, listing cautions and the aims of treatment.


A Registered Canine Hydrotherapist (RCH) has fulfilled the NARCH Training requirements for registration and must keep up to date by completing a further 20 hours of Continued Professional Development training each year.

RCHs are required to abide by the guidelines and rules set out in the Guide to Professional Conduct for Registered Canine Hydrotherapists and must hold public liability and professional indemnity insurance.

An RCH will maintain client and professional confidentiality.

RCHs are listed on the NARCH website; it is possible to check their registration is valid and see their level of training and areas of competence or expertise.

NARCH has the highest training requirements for registration in the UK.

If a hydrotherapy centre is listed on this website you can be assured that all hydrotherapy treatment will be carried out or supervised (in the case of a trainee) by an RCH.



  • Decreased pain perception
  • Relaxation of muscle tension and/or muscle spasm
  • Reduction of oedema - either because of hydrostatic pressure or with increased limb movement in water
  • Decreased inflammation
  • Patient may be more compliant with 'hands on' treatment and PROM in water
  • Possible feeling of well being due to release of endorphins and this may result in better mobility and a reduced medication requirement


  • Non weight bearing environment in hydrotherapy pool
  • Controlled weight bearing in underwater treadmill
  • Potentially earlier return to normal function
  • Support for weakened or spinal injury dogs in neutral spinal position - increased core stability gained with swimming, walking in underwater treadmill and dynamic standing exercises


  • Increased active range of motion - choice of hydrotherapy pool or underwater treadmill depending on which joints require increased flexion or extension
  • Improved muscle patterning and recruitment
  • Increased muscle bulk, strength and tone
  • Prevention or reduction of muscle atrophy



  • Increased sensory perception - from action of water and hands on with hydrotherapists
  • Animal can be supported in standing by the buoyancy of water and the hydrotherapist - helping to gain confidence and enough time to make corrections without falling
  • Dogs with neurological deficits benefit from hands on gait retraining - particularly in the underwater treadmill



  • Reduction of frustration for dogs on cage rest or reduced/lead only exercise - less likely to be 'uncontrollable' on land
  • Slowing of progression of degenerative disease processes - particularly useful for maintaining fitness and strength in Degenerative Myelopathy cases
  • Improved quality of life for dogs with reduced mobility
  • Prevention of secondary complications such as atrophy and contracture
  • Improved cardiovascular fitness
  • Reduction in obesity as part of a weight control plan



  • Orthopaedic
  • Neurological
  • Soft tissue injuries
  • Degenerative and medical conditions
  • Conditions related to age - developmental or geriatric
  • Long term disability



  • Osteoarthritis
  • Hyperextension injuries
  • Fractures
  • Luxations and sub luxations
  • Spinal injuries including recovery after surgery
  • Neurological and proprioceptive deficits
  • Spondylitis
  • Spondylosis



  • Hip dysplasia - lifelong management, pre and post operative total hip replacement
  • Legge Calve Perthes disease - pre and post operative FHO, FHNE, etc
  • Cruciate ligament rupture -conservative management
  • Cruciate ligament rupture - post operative recovery hydrotherapy programs dependent on type of surgical repair
  • Patella luxation - either conservative management or post operative



  • Elbow dysplasia - management or post operative
  • Shoulder injuries


It is important that you inform the hydrotherapist of any medical condition that may affect hydrotherapy treatment. Some medical conditions contraindicate hydrotherapy and others mean that hydrotherapy treatment should only be carried out with caution. However there may be some situations where the benefits of hydrotherapy can outweigh possible concerns.

The lists below are not exhaustive but are a useful guide.



  • Open wounds
  • Surface infections
  • Contagious diseases
  • Cardiac and respiratory dysfunctions
  • Severe peripheral vascular disease
  • Epilepsy - one or more fits in week preceding hydrotherapy
  • Water phobia causing extreme panic reactions
  • Vestibular syndrome



  • Incontinence
  • Obesity
  • Breeds with elongated soft palate
  • Brachycephalic breeds
  • Laryngeal paralysis and tie backs
  • Decreased exercise tolerance
  • Cushings/Addisons disease
  • Diabetes
  • Epilepsy
  • Heart murmur or heart disease
  • Spinal injury
  • Extreme laxity of joints - hyperextension injuries
  • Undiagnosed forelimb lameness - risk of worsening any cervical spine problem due to extension of neck



If surgery is planned, pre-operative hydrotherapy can provide a number of benefits.

  • The dog has time to become familiar with, and confident in, a hydrotherapy situation before it undergoes the surgery. This is particularly important for dogs that have never swum or who may be fearful - learning to swim immediately post operatively is not ideal.
  • RCHs have an opportunity to build up a positive relationship with client and dog so that the client feels confident of the care the dog will receive following surgery.
  • Some veterinary surgeons use pre-operative hydrotherapy to improve strength and fitness to condition prior to surgery, helping to reduce recovery times post operatively.



It is important to understand the basic principles and effects of immersion and movement in water. This gives a greater insight into how hydrotherapy treatment can be so effective for patients. The following is an extract from a 2002 document written by Christelle van Wyk, BSc Physiotherapy, PGDip Veterinary Physiotherapy and edited by Angela Griffiths CCRP, RCH.

Hydrotherapy Principles


Check the List/Register or find a Hydrotherapy Centre

Recent news

In light of the extraordinary circumstances that are affecting us all, the NARCH Management Committee have agreed that all active RCH’s will have their annual registration renewal fee reduced from £115 to £85. Additionally, where the registration renewal date falls in the period 24th March 2020 to 24th June 2020 inclusive, a 3-month fee payment holiday will be granted.

For those RCH’s whose annual registration renewal date falls in the period 24th March 2020 to 24th June 2020 inclusive, a 3-month fee payment holiday will be granted. Once a 3-month period has elapsed from the date of their original registration renewal date, NARCH will send an invoice to the RCH for the reduced sum of £85. This method ensures that all RCH’s retain their same annual registration renewal date.
For all RCH’s with a renewal date falling in the period 25th June 2020 up to and including 23rd March 2021, NARCH will send an invoice for the reduced annual registration renewal fee of £85.
Should any further periods of lockdown be put in place by the Government after 24th June 2020, up to and including 23rd March 2021 as a result of Covid-19, the NARCH Management Committee will review matters and advise accordingly.

No action will be required from RCH’s.  All RCH’s who have a re-occurring automatic payment instruction in place with PayPal will receive a notification from PayPal that their instruction has been temporarily suspended. After 23rd March 2021, NARCH will ensure that all re-occurring automatic payment instructions are re-instated.

Please note that the reduced annual fee of £85 and the 3-month fee payment holiday, will only apply to those RCH’s whose names appear on the NARCH Register and will not apply to those RCH’s who are suspended from the NARCH Register.


To see previous updates see News