Some of the most common sharks are dogfish sharks. They include the piked and the spiny dogfish.
There is a huge family of dogfish sharks, containing around 80 different species.
Dogfish sharks usually have spines in front of their dorsal fins and they have no anal fin at all.
Dogfish sharks range in size from less than 20 cm long to over 6 m long.
Millions of Dogfish sharks are caught every year - for their meat but also for their fins, oil and skin.
Spiny Dogfish sharks are ground up to be made into garden fertilizer.
Spiny Dogfish often cause problems for fishermen. They tear up fishing nets and steal lobster from lobster pots.
Many species of Dogfish sharks swim together in groups.
Dogfish sharks may have their name because they have packs, like dogs. In the past, any type of plant or animal used to be given the name 'dog' like the dog rose, for example.
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