It is simple bringing an animal back to the US.

The top half (up to after purchasing your airfare) apply.
//ambergriscaye.com/forum/ubbthreads.php/ubb/showflat/Number/313031/Searchpage/6/Main/32878/Words/PET/Search/true/Updated_Travel_with_Animals.html#Post313031

The vet here in Belize will give you an international health certificate and you'll also need to have a copy that the animal has all of its shots. That's it. Easier going to the US with a pet than from the US to Belize (where nightmares can and HAVE happened!)