Carriers for dogs traveling in the cabin will have to fit beneath the seat in front—check your airline's specifications for the correct dimensions. If you're bringing your dog into the cabin, the carrier will count toward your carry-on baggage allowance on most airlines.
Do dogs ride in the baggage compartment?
Yes, pets should be permitted in the cabin with their companions. It is not absolutely safe for the animals to travel in the cargo hold. Many things have gone wrong in the past: extreme temperatures, noise, chewing their way out and even being lost.