You should contact the Reservations Department at (+7) 3412-630-677 to book Fido's spot on board well in advance of your departure date.
Pets in the Cabin
Small cats and dogs can travel in the cabin if the combined weight of the pet and carrier does not exceed 17 lbs (8 kg). The fee for this service is 300 rubles per kg. The payment for this service is made after you register Fido for travel.
For pets traveling as checked baggage, carriers must be sturdy, convenient for transportation, well-ventilated, and lockable. The bottom of your carrier must be waterproof and covered with an absorbent material to prevent spillage.