Isaac Benjamin Jones, 29, of North Logan Road, Billimari entered a plea of guilty to a charge of reckless grevious bodily harm when he appeared before Magistrate Michael O'Brien.

Convicting Jones, Mr O'Brien said nothing short of a jail sentence would be appropriate, setting a non-parole period of four months.

Jones will be eligible for release on February 6, 2021.

According to police facts, tendered to the court, the incident that lead to the assault followed Jones calling in sick for work due to the death of his dog on June 5 this year.

Police say about 6.50am on June 9 when Jones returned to work he was standing in the doorway of his workplace's meal room when his victim made a passing remark about the deceased dog asking "how's your dog?".

Police say Jones then approached the victim and punched him in the face before slapping him to the back of the head.

Jones then left the meal room before returning a short time later and challenging the victim to a fight.

Police say the victim remained seated in the meal room and did not accept the challenge.

Jones left the workplace a short time later in his vehicle.

The victim also left the workplace and after feeling unwell presented at Cowra Hospital for treatment.

Medical professionals transferred the victim to Westmead Hospital by plane where he underwent facial reconstruction surgery for his injuries.

The court heard the victim now has two titanium plates and 10 screws inserted in his face.

Jones's solicitor June Langfield admitted to the court her client "has a less than impressive record" having already spent time behind bars.

She claimed her client had apologised verbally to the victim and had also written an apology to the victim.

A less than impressed Mr O'Brien told Ms Langfield her client's "criminal history is now 16 pages in length".

"He first came before the court in 2013 for which he received a suspended sentence with an intervention plan," Mr O'Brien said.

"Then two years later he was before the court for common assault and received a two year bond.

"And then after all of that he received a lengthy term of imprisonment.

"Not withstanding that experience, here he is again because someone made an off hand remark about an animal.

"And only now does he acknowledge he has a problem with violence and 'I better do something about it' - no doubt after having the benefit of your advice.

"He knows only too well the seriousness he has placed himself in.

"One wonders what he would have done if someone had said something seriously offensive.

"Your client should have a flashing red light around him announcing - keep away, short fuse.

"He has an inability to contain his rage, there is something wrong when someone reacts that way.

"You cannot continue through life with an explosive temper," Mr O'Brien told Jones.