Employment contracts exist even if they are not in writing. The problem with oral contracts is in trying to enforce them. Contracts require a meeting of the minds of two persons followed by some form of payment for enforceability. Employees, although commonly intimidated, must realize they are on equal footing with the employer.
I'm a second-year veterinarian currently negotiating my second professional contract. How much should I expect in terms of salary, benefits, and time off? I'm currently on ProSal, and I'm happy with that structure.