As a practicing therapist I follow the Veterinary act (as below) and obtain your veterinarians permission to treat prior to your appointment.
The Veterinary Act
An act passed in Parliament to safeguard the welfare or sick or injured animals. It’s an offence for any persons, other than the owner, to treat an animal unless permission of the vet in charge is sort and obtained.
Updated 19 February 2015
19.1 The purpose of this guidance is to explain the restrictions that apply under the Veterinary Surgeons Act 1966 (‘the Act’) to ensure that animals are treated only by those people qualified to do so. These restrictions apply where the ‘treatment’ is considered to be the practice of ‘veterinary surgery’, as defined by the Act.
19.2 Section 19 of the Act provides, subject to a number of exceptions, that only registered members of the Royal College of Veterinary Surgeons may practice veterinary surgery. 'Veterinary surgery' is defined within the Act as follows:
‘“Veterinary surgery” means the art and science of veterinary surgery and medicine and, without prejudice to the generality of the foregoing, shall be taken to include—
a. the diagnosis of diseases in, and injuries to, animals including tests performed on animals for diagnostic purposes;
b. the giving of advice based upon such diagnosis;
c. the medical or surgical treatment of animals; and
d. the performance of surgical operations on animals.’
In addition, in the context of what we are talking about, the Veterinary Surgery (Exemptions) Order 1962 (made under the Veterinary Surgeons Act 1948 but kept alive by the 1966 Act) permits:
The treatment of an animal by physiotherapy if carried out under the direction of a registered veterinarian who has examined the animal and prescribed such treatment.