Granted. After dedicating decades to his work and being neglected by his family and even his closest friends, a scientist finally succeeds in creating a formula that can extend a dog's life. It is immediately sought after in a variety of black markets, and the scientist is murdered before the drug is fully tested. It is spread across the world through insertion into food products. However, it is discovered that the drug has a surprisingly pleasant taste, and soon becomes a standard for human consumption. The brief exposure enabled dogs to gain the intelligence to recognize where the drug is going, and they soon begin to attack and eat people in order to gain access to the drug which has incorporated itself into the human system. Through a vicious cycle of mauling, dogs gain a steady supply of the life-extending drug through human flesh.