As mentioned, some programs are intended to be for professional development, and as such, require that the student have professional experience, be it paid or volunteer, in an animal-related or behavior-related field, for which they are seeking to upgrade and expand their professional skills and knowledge. Professional membership or certification in a professional association or certifying body also satisfies the entrance requirement. Having completed a preparatory program of study in an animal-related or behavior-related field also satisfies the entrance requirement. This stipulation does not require you have a specific number of hours or have achieved an advanced level of practice, just that you have professional experience or have taken a vocational program of study in it already or have a certification or professional membership in a professional association or certifying body. Even minimal participation in an animal-related or behavior-related job satisfies the entrance requirement be that paid or not.