(October 2013). A Cockapoo is a mixed-breed dog that is the cross between either Cocker Spaniel breeds (American Cocker Spaniel or English Cocker Spaniel) and a poodle (in most cases a miniature poodle or toy poodle). healthy 12-week-old cockapoo. As with a lot of smaller dogs they tend to be quite long-lived, and it's not unusual for cockapoos to live to 15 years or more. However, both purebred poodles and cocker spaniels can suffer from luxating patellas (loose knees), and this can be passed on to their offspring.