@The quite one: Let me start by asking you to define suffering in the context of your post, i see you mentioned animal suffering, well what about plant suffering too? when you buy that orange from the market and slice it up to fill your desire do you in any way feel the orange might have suffered? after all its a living thing too right? So why just concern yourself with animals?
Is it because plants cant make those sad faces? or perhaps because they dont have blood? If i am allowed to speak my mind, frankly i think most of you are acting hipocratically. Why are you pretending to care for animals all of a sudden?
If there is one thing i find intruiging, its how evoltion tries to clasify humans and animals as not so different, i mean dont they teach that we all stemed from the same ancestry way back in time? And i am not too familiar with the concept of evolution but if life started in a basic singular from then dont both animal and plants share the same ancestory? So its like
(Human = Animal = Plant) = Life(Billions of years back) . i could be wrong though but i think you get my point.
Now back to your question about why God allows suffering(animals specifically). If there is anything to be said i think the bible has quite detailed answers about your question, that is if you believe its credible enough for you.
Genesis 1: 30(KJV) = And to every beast of the earth, and to every fowl of the air, and to every thing that creepeth upon the earth, wherein there is life, I have given every green herb for meat: and it was so.
That should give you an idea of how God intended things to be. Man and animals alike were not created carnivorous from the beginning, they were made to be herbivous from the start. And it was so till the falling away. One thing you should realize is that the earth was made for man, and man was to dominate it all. Any action of man did not just have effect on him alone, but on the earth and all that exist on it too.
The tree of the knowledge of good and evil was the enbodyment of all the principles of good and evil we experience today, violence, pain,suffering to name a few.