A federal criminal complaint shows the K-9 detected the drugs while working with a postal inspector at a mail processing facility in Lubbock.
The complaint says once the postal inspector obtained a warrant to search the package, authorities discovered 16 ounces of methamphetamine inside the box.
Investigators repackaged the box and the postal inspector went undercover as a mail man to deliver the package to its intended address.
When the postal inspector arrived at a house in Amarillo, the warrant says, Jaime Caraveo-Chacon took the package and then left the house in his car.
DEA agents followed Caraveo-Chacon, who led authorities on a high-speed chase before he bailed out of his car on foot and was arrested.