Brian Chapman (pictured) faces charges of burglary - for entering the man's garage - and bestiality

A householder raised the alarm after catching a mailman in Minnesota having sex with his dog.

The man became suspicious because mailman Brian Chapman, 21, spent far too long in his garage when he was supposed to be delivering parcels to his rural home outside Crookston.

The resident, identified only as TAL, had his home kitted out with a security system which notified him on his cellphone when someone came onto his property.

The Smoking Gun said the man was 'going to call the post office to have them tell his mailman to stop going into his garage to leave packages.'

But before he did that he reviewed the footage from the surveillance cameras around his home and was shocked and disgusted by what he discovered.

In court documents Polk County Sheriff's Office Deputy Kyle Olson said Chapman was recorded on camera on February 7 entering the garage around lunchtime and putting down a package before engaging in a 'sexual act with a dog, which was in the garage.'

Chapman has been charged with burglary, which is a felony, and bestiality, which is a misdemeanor. The documents accuse him of having carnal knowledge of the dog.

Chapman, who lives in Crookston, has not yet entered a plea and was not available for comment.