Jackie and Colin were neighbours. They both owned dogs. In February, Colin had to visit his mother who lived in Saskatchewan because she was injured in a car accident. Colin was away for two weeks. Before Colin left for Saskatchewan, Colin ran into Jackie and told Jackie about his mother's situation. Jackie said to Colin: "I will look after your dog while you are away if you promise to take care of my dog for two weeks in May. Have a safe flight." Colin agreed. Jackie looked after Colin's dog for two weeks. In May, Jackie told Colin that she planned to go away for vacation and asked Colin, in return, to look after her dog. Colin refused. Colin said to Jackie, "You should take your dog to the doggie hotel since you have money to go on vacation." Did Colin breach a contract? Why or why not? Define any legal concept or term that you use