When flying with Sun Country, are pets allowed? In accordance with the Sun Country Pet Policy, visitors may make separate reservations for their dogs' lodging. This is possible while making a reservation directly through the business' website or by calling their helpline number. Pets are allowed in the cabin on Sun Country flights but not as checked luggage. However, there isn't a cargo option. The lodging's pet box requirements may change depending on the size and weight of the pet being flown there. It is the traveler's responsibility to provide the airlines with proper health information about their pet prior to boarding.