JACKSONVILLE, Fla. -- A sergeant with the Jacksonville Sheriff's Office is suspended after what police investigators found was use of excessive force in an incident with his neighbor last summer.

The sheriff ordered Sgt. Bryan Selzer suspended for 20 days after an internal affairs review of an altercation Selzer had with neighbor in August. During the incident Selzer allegedly entered his neighbor's home without permission and shocked the man seven times with his Taser gun.

"I think what this boils down to is an overreactment," JSO Undersheriff Frank Mackesy said.

Selzer told investigators that he was walking his dog when he heard two neighbors yelling and he approached them to ask that they stop.

Selzer said one of the men, Brian Hall, walked away and back into his apartment, so Selzer went to his door.

"He said, 'Hey, I know my f------ rights. Don't come in my house.' I said, 'I don't plan on coming in the house,'" Selzer testified.

Selzer claims that Hall then threatened him with his two pit bulls.

Selzer said Hall refused repeated requests to put his dogs away and he pulled out his Taser gun and used it for his own safely. He also admitted under oath that the pit bulls never even growled at him.

Selzer told investigators during sworn testimony he's almost 100 percent sure he only used his Taser gun four times. Investigators said evidence indicates Hall was shocked seven times by the Taser gun.

Hall said it hurt so bad he thought he had been shot.

"I let go of my dog after the first one," Hall told Channel 4's Diane Cho. "I'm on my stomach trying to crawl into the kitchen to get away from him and he shot me a few more times on my legs and my side."

During the altercation, police received a 911 call from a woman asking for help protecting her and her boyfriend from Selzer, who was off-duty, but still dressed in his police uniform.

Other officers called to the scene that night told investigators the Selzer made several inconsistent statements about why he was trying to arrest his neighbors.

During the civil service board's review of the recommended discipline, Selzer maintained he only stepped foot in Hall's apartment once he had to make an arrest, but the internal affairs report said evidence does not support that claim.

Mackesy said he believes that Selzer was way out of line and trying to falsely arrest the couple and told a civil service board hearing that his sergeant had no right to go into Hall's home.

"Two people were falsely arrested," Mackesy said. "You know what? The guy, Hall ...he is a pain in the behind .... He was making it miserable for the people who lived around him in the community. But that does not give us the right to violate his constitutional rights."

The internal affairs board recommended disciplining Selzer for conduct unbecoming an officer, in competency and excessive force.

Mackesy's strong criticism of Selzer comes despite the fact that Mackesy was best man at his sergeant's wedding.

Mackesy said he actually recommended that Selzer be demoted over the incident, but Sheriff John Rutherford decided on 20 days suspension.

Hall told Channel 4 that the incident occurred after he made a remark to another neighbor about how unfair it was that Selzer could keep a German shepherd in his apartment when no one else in the complex was allowed to keep a large dog.

Hall, who said his life fell apart after the incident and he has since moved out of state, doesn't feel like a 20-day suspension is enough of a penalty for the sergeant's behavior.

"I feel like he got a slap on the wrist," Hall said. "I know if I would've Tased one of my neighbors like that, I would be in jail."

Documents show the state attorney's office does not plan to press charges against Selzer because it was believed he was acting in good faith.

Two weeks ago, six JSO rookie officers were fired one day after graduation for inappropriate behavior during training at the police academy.

Asked why they were fired over sexual harassment and humor when a veteran officer was suspended for excessive force, Mackesy called them "different instances."

"One is a guy... is a supervisor who should've known better. The other is a group of probationary employees who showed lack of respect for women in academy environment and sheriff made it clear he won't deal with that," Mackesy said. "We don't like firing people, but it comes with the territory, and if were going to maintain the community's trust, we have to make hard calls like this."

Selzer appealed the 20-day suspension to the civil service board, which upheld the discipline.