Bísara breeding pigs, of Celtic origin, are large animals, reaching over 1 meter tall and 1.5 meters from the base of the neck to the tail, with a black coat, white or with white spots, thick skin with long bristles, thick and abundant. The head is long and thick, with long hanging ears, face and a big mouth. The neck is long and muscular. The trunk is long, with an arched back, high chest, flat and shallow, long and short flank, a dropped close rump and little muscular and a pronounced belly.

The extremities are long, bony and not very muscular, giving certain elegance. The thighs are long and narrow not very muscular, the feet are well developed. The tail is thick and half inserted. The animals have a very docile temperament and somewhat slow and graceful movements. They are very fertile.

The structure of the Bísaro pig has a greater proportion of muscle to fat, yielding a meat that is interlined with fat and lean, whose flavour is enhanced with the food that these animals are subjected to, which is rich and varied.