When God created the world, he designed it perfect. Man and animals were cohabitable. But without the slightest doubt Man was created to be superior
to animals. But Man decided he could choose for himself his own ways, and not listen to his creator, God.
So when Man's own selfish desire led him to sin, then all creation - stars, earth, animals, man, etc. - was corrupted by that sin. Man was a
vegetarian, corruption made him into a carnivore. And animals that once were docile and freindly to man, became hostile and dangerous carnivores as
well by man's sin.
Dolphins and other domesticated animals are God's way of reminding us that He once had a perfect plan for us, and by our own choosing of deciding His
way wasn't good enough, we have screwed up everything.
Fortunately, God is Holy, Perfect, Righteous, Merciful and Forgiving. If we turn to Him and admit our sins, He is able and willing to forgive them.
This world will never be corrected, but it will be destroyed along with all the corruption and be made "new" (a spiritual Earth, as it were) that
will never again see sin and death and corruption.
Lets indeed enjoy animals like our domesticated dogs and cats, and wonderful creatures like dolphins and horses, etc. But do not confuse them as
being superior or more important than man. Animals have souls but not eternal spirits like humans do. They can be companions, laborers, pets, food,
whatever, but they are not superior.
Nevertheless, I too have read many stories about Porpoises that are similar, and I thank God that He made these wonderful creatures that we can enjoy,
and that can help us in our times of need if possible.