It depends on what kind of dolphin you mean, mammal or fish. The mammal dolphin and porpoise are the same creature, so they probably get along just fine. There is, however, a fish Dolphin (also known...
Some Differences between dolphins and porpoises are:
A dolphin usually has a pointed snout, while a porpoise has a snout that is short and blunt.
A dolphin's leading edge on the dorsal fin is...