Soldiers manning an observation post in the area spotted the man as he crossed the border into Israel, and a patrol unit was dispatched to pick him up.
Army officials said the man was sent back to Lebanon a short while later after being questioned by security personnel.
During his questioning the man said he was a shepherd and that he had crossed the border by mistake.
Prior to the Second Lebanon War of 2006, Hizbullah used the Lebanese side of Ghajar as a base to spy into Israel, and also tried to launch several attacks against Israeli soldiers from the area.
The period following the war saw a number of incidents in which Lebanese shepherds crossed the border into Israel.