A fang is a root of tooth, pointed tooth, snake's poison tooth. In mammals, a fang is a canine tooth, used for biting and tearing flesh. In snakes, it is a venom-injecting tooth (see snake venom). Spiders also have fangs, which are part of the chelicerae.Fang- An ancient study of a rapid evolution of snake fangs counterpart the increasing venom of a snake fang at the upper jaw part since embryonic stage. Front-fanged snakes such as cobras and vipers as snakes grow, rear-fangs will become the long extension of a front fang which is a fast reacting venomous glands. 7 month puppy has 42 teeth. K9 Dogs are trained to assist policemens from catching criminals or other illegal activities that police authorities should give their fastest solution as they can. K9 dogs are trained to diagnose a bomb threat. Dogs has canines which include the upper and the lower fangs. Dogs are carnivores, in which they serve as a predators in the following teeth characteristics or descriptions: high-crowned and pointed teeth.