Even though the air in the pressurized cargo hold (where pets are transported) is the same as in the passenger cabin, the air circulation might not be ideal for a snub-nosed dog.
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A: Because of their anatomical abnormalities, short-nosed breeds seem to be more vulnerable to changes in air quality and temperature in the cargo hold of a plane.
Air Travel Restrictions for Snub-Nosed DogsWhile pet-friendly airlines strive to accommodate temperature-sensitive breeds, many carriers impose travel restrictions during warmer months (typically mid-May to mid-September). This can make finding flights for snub-nosed dogs challenging during peak summer seasons.
Breeds are selected for the restricted breed list not because of any fear of the breed itself, but reported cases of a particular breed have a particularly strong jaw set and therefore being more likely to break out of an airline crate during the trip. These special boxes are for the safety of the pet and the aircraft.
CABIN VS CARGOTypically, they need to weigh 20 lbs. or less, following the airline's carry-on luggage weight restriction. If you have a large dog, you can still take them on the plane but not in the cabin. Depending on how large your dog is, they could travel as checked baggage or as cargo.
A common question is whether to take your Frenchie with you in the cabin or if your pup will be okay to fly as cargo. French bulldogs are brachycephalic breeds–flat nosed dogs–and those breeds are banned from flying commercial airlines underneath the plane.
Several airlines do accept large dogs by storing them in the plane's cargo. The hold is temperature-controlled and pressurized, so it is a humane way to transport them. For most airlines, pets weighing 17 pounds or more qualify as large and must travel in the hold.