Phule Me Twice

Description for PHULE ME TWICE by Robert Asprin with Peter J Heck:

YOU CAN'T MISTAKE JUST ANYONE FOR A PHULE.

When the, planet Zenobia is invaded, Captain Willard Phule is made their military advisor. The first priority for Phule's Company: staying out from underfoot of the peaceful, dinosaurlike Zenobians...

But, unbeknownst to the Zenobians, they're getting two Phules for the price of one. A robot double of Phule appears out of nowhere. And only the real Phule knows who the real Phule is...

This is #4 in Phule's Company Series.