If you are traveling to Senegal with Canadian passport in most cases you do not need to obtain entry visa to Senegal at the consulate beforehand. The period of stay though may be limited by the laws of Senegal. You may check what is the allowed period of stay at the Senegal consulate in Canada. All other applicants should check information on Senegal visa requirements, procedure, application forms, fees and processing timings may be found here: http://senegal.visacenter.ca.