A Brooklyn school administrator was arrested on charges he starved, abused and abandoned a French bulldog in his filthy Long Island apartment bathroom, authorities said yesterday.

Frank Hopson, 59, was nabbed Thursday afternoon outside Clara Barton HS, where he is an assistant principal.

A maintenance worker in Hopson’s Freeport, LI, complex found the bulldog emaciated in a bathroom back in July 2008.

Hopson faces up to a year in jail on animal-cruelty charges and is due in Nassau County court May 4. It took nearly two years to arrest him because officials struggled to find him, a district attorney’s office spokeswoman said.

Hopson could not be located for comment.