The hit series shows the adventures of Pif, a brown-yellow dog and Hercule, a black-white cat. They are constantly feuding and annoy each other but in fact they really are best friends.The hit series shows the adventures of Pif, a brown-yellow dog and Hercule, a black-white cat. They are constantly feuding and annoy each other but in fact they really are best friends.The hit series shows the adventures of Pif, a brown-yellow dog and Hercule, a black-white cat. They are constantly feuding and annoy each other but in fact they really are best friends.