Pet Grooming business. Business Overview The main requirement for starting a pet grooming service is obvious. You or an employee must be a pet groomer. Many pet groomers are not officially certified, however, those who take the time to register and complete a pet grooming certification course will be doing themselves, their clients, and their customers (pets) a great favor. A pet grooming service is very inexpensive to start, and has the potential to be extremely profitable, as...