In Miocene and Oligocene in Europe the ancestor of the canine family evolved, soon giving rise to many species of small dogs.  Toward the close of the ice age the majority of dogs and other animal species were extinct in North America.  At first dogs only howled, but later on they learned to bark.  Dog was first adopted by blue man.  It was the first animal to be domesticated. It was used for food, hunting, transportation, and companionship.  The dog was the first domesticated animal and was held in high esteem both as such and as food.  The employment of watchdogs made it first possible for the whole clan to sleep at night.  It was believed that dogs could detect the approach of ghosts, and that they gave warning by howling.  The death of Abel became known to his parents when his dogs brought the flocks home without their master.  The dog came to be the sacred animal of the Parsees. 
Jesus and Ganid had enjoyed playing with a very intelligent shepherd dog, and Ganid wanted to know if the dog had a soul, if it had a will. Jesus replied that the dog cannot know God and cannot enjoy a spiritual experience.  It was the dogs that caused the swine to fall off a cliff in the event of Jesus' supposed healing of a demoniac in Kheresa. 
Norana, the Syrian woman who wanted Jesus to heal her daughter, compared herself to a dog that wants to eat the crumbs that fall from the table of the privileged, something that caused Jesus to praise seeing such great faith. 
Jesus said: “Present not that which is holy to dogs, neither cast your pearls before swine, lest they trample your gems under foot and turn to rend you”.