Obedience trials were designed to test the dog’s suitability as a good companion. Basic tests include both on and off leash heeling, sit, stand, stay and coming when called. At more advanced levels, dogs are asked to jump, retrieve, respond to signals, and identify and retrieve articles carrying their handlers’ scent.
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To achieve an obedience title, the dog and handler must successfully complete the routine for that level three times, under three different judges. Each qualifying score is called a "leg", and three legs equals a title. The titles must be earned in order. The Novice (CD) title must have been won before the dog may compete in the Open (CDX) class and the CDX title must have been won before the dog may compete in Utility (UD). There is also a Pre-CD, or PCD, which is an unofficial title, but a great way to get both dog and handler used to being in the obedience ring.
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Rally is a companion sport to Obedience, with both sports requiring teamwork between dog and handler. Dogs in rally obedience events should demonstrate willingness and enjoyment, and handlers may encourage the dog, while working through the course of 10-20 stations.
Rally titles include: Rally Novice, Rally Intermediate, Rally Advanced, Rally Excellent, Rally Advanced Excellent, and Rally Master. Rally Novice is the only level performed on leash, all others are off leash. 


Resources:
​Obedience and Rally rules and regulations
www.ckc.ca/en/Files/Forms/Shows-Trials/Event-Rules-Regulations/Combined-Rally-and-Obedience-Rules-and-Regulations.aspx