It will cost whatever the flight is from Belize to your Destination..Unless the dog is the size of a Shih Tzu, then he/she can be classified as a carry on since they can fit under your seat. If that is the case the dog would fly free. I have done this numerous times with dogs. I just recently purchased a Pure Bred Boxer from getting Euthinized and it cost me $300 from Kansas to Seattle.