The short answer is: yes, get a plan that covers cancer and chronic diseases.Sadly, cancer is common in dogs and cats. It's the leading cause of death in dogs over the age of 10. However, the good news is that half of all cancers are curable if caught early. Make sure your policy covers cancer and doesn't place a limit on the amount you can be reimbursed for cancer treatment expenses (cancer would likely be treated as a single incident on a policy that has a per-incident limit). Also, make sure your policy covers chronic diseases (which are long-term and usually not curable) on a continual basis (meaning, coverage continues for that disease after the year it was first diagnosed).