The club have taken up their option to extend the former Watford man’s contract by a year.
And the head coach explained: “He shows our identity as much as any other player in the squad.
“Hoggy is a real Terrier on the pitch, I like his style and I like his character as well.”
It’s been an injury-hit season for Hogg, who cost £400,000 when he signed in July 2013.
He returned to the squad after a knee problem for the final two Championship games, but didn’t play.
Now Wagner is determined to ensure the 27-year-old remains fit for as long as possible.
“When he trains and plays regularly, he is a top performer for us,” said the boss.
“Injuries have troubled him, so we must do everything to prevent them.
“It was great to have him back for the two weeks.
“It would be very exciting for me to see him stay fit for a whole season.
“Then I think we would see the best Jonathan Hogg we have ever seen.”