Dolphins and sharks are living in the ocean animals, so sometimes they will meet, sometimes they will fight. It depends on the specific situation whether the dolphin or the shark is more powerful. Because there are many species of sharks, not all of them are as fierce as we take them for granted. For example, pygmy sharks and other species, their size itself is relatively small. Dolphins are basically not afraid when they encounter such a small shark, and dolphins are more powerful than the two. However, some sharks are larger, have sharper teeth and are more ferocious, such as the great white shark.
In the face of such a fierce shark, a single dolphin can not beat them, but the speed of dolphins compared to sharks will be faster, easy to escape, will not be easily eaten by sharks. If the fierce shark encounters a group of dolphins, then of course a group of dolphins is more powerful. Because dolphins know how to cooperate with each other and take turns to attack the side of the shark's body. This can be said to be the shark's soft rib, after being attacked, the shark's internal organs are easy to rupture, the shark is likely to die, or lose most of the attack power.
As mentioned above, dolphins can beat sharks. Even in the face of very fierce sharks, as long as the dolphins act collectively and cooperate with each other, it is relatively simple for them to fight sharks. The side of the shark's body is their greatest weakness, because sharks are cartilaginous fish, so their spines have limited protection for their internal organs, in the case of a fierce attack by dolphins, the shark's internal organs are easy to rupture, at this time the shark may die.