In order to offer dog fitness, there are no uniform requirements as far as training is concerned. It depends on various factors such as the country where you work and the requirements of your employer.
Some dog fitness trainers have a background in veterinary medicine, others have training in dog training, while still others just have extensive experience working with dogs.
In some countries, there may be certain certifications that can be obtained in order to work as a dog fitness trainer. For example, in the United States, there are some organizations that offer certifications for dog fitness trainers, such as the Canine Fitness Coach Certification Program or the Certified Canine Fitness Trainer Program.
However, it is important to note that there are no legal requirements for dog fitness trainers and it is always advisable to carefully check the background and experience of a potential trainer before deciding to work with them.