The Spiny Dogfish is a type of shark that has venomous spines on its dorsal fin. There are over 100 different species and this shark prefers to hunt closely together. They got their name due to their tendency to hunt in packs. Atlantic spiny dogfish can live as deep as 3,000 feet, and Pacific spiny dogfish can live up to 80 years of age. These sharks are no threat to humans, unless a human accidentally touches its venomous spine. The Spiny Dogfish is a type of shark that has venomous spines on its dorsal fin. There are over 100 different species and this shark prefers to hunt closely together. They got their name due to their tendency to hunt in packs. Atlantic spiny dogfish can live as deep as 3,000 feet, and Pacific spiny dogfish can live up to 80 years of age. These sharks are no threat to humans, unless a human accidentally touches its venomous spine.