The young bull was caught on CCTV as it entered Cummins' SuperValu in County Mayo.
It charged past the reduced section to the frozen foods department before turning round and running back out of the shop.
John Cummins, the shop owner, said: "The bull ran down one aisle, and into the store area, where he had a good look around and came back out again.
"He then charged down another aisle, and out the front door again.
