Why is the curse of original sin not specific to humans? From what I learned in church the whole world "fell" after Adam sinned.

Now the typical question is why should everyone have to pay the price and is usually answered by we would have done the same if in Adams shoes.

However,  I have a hard time applying that logic to the rest of the entire world.

Why should everything else in the world have to pay the consequences of humans?

For example why should our pets have to experience sickness and death and suffering? 

Or sea creatures or even plants etc.? 

Is this fair and just?
This is not a complete answer, but thought it would be good to point out nonetheless.

God had given Adam and Eve the dominion over the earth, the fish, birds...

"And God blessed them. And God said to them, 'Be fruitful and multiply and fill the earth and subdue it and have dominion over the fish of the sea and over the birds of the heavens and over every living thing that moves on the earth.'" Gen 1:28 ESV

My understanding of the results of the fall are that man's actions caused a ripple effect down the hierarchy of the earth. God entrusted the earth to Adam &amp; Eve, and when they fell, much was affected.  This would include those things that they have dominion over, from my perspective.