How small does your dog have to be to be as carry on internationally?

To qualify as a carry-on pet for international travel, most airlines require dogs to be small enough to fit comfortably in a carrier under the seat in front of you. Generally, this means your dog should weigh around 15 to 20 pounds (7 to 9 kg) or less, depending on the airline's specific regulations. Additionally, the dimensions of the carrier must meet the airline's size restrictions, which typically allow for carriers measuring around 18-20 inches in length, 10-12 inches in width, and 10-12 inches in height. Always check with your airline for their specific policies before traveling.