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It really is an interesting question.

Genesis 1 states: [29] And God said: Behold I have given you every herb bearing seed upon the earth, and all trees that have in themselves seed of their own kind, to be your meat:
Dixitque Deus : Ecce dedi vobis omnem herbam afferentem semen super terram, et universa ligna quae habent in semetipsis sementem generis sui, ut sint vobis in escam :

[30] And to all beasts of the earth, and to every fowl of the air, and to all that move upon the earth, and wherein there is life, that they may have to feed upon. And it was so done.
et cunctis animantibus terrae, omnique volucri caeli, et universis quae moventur in terra, et in quibus est anima vivens, ut habeant ad vescendum. Et factum est ita.

And St. Paul, Romans 8: [19] For the expectation of the creature waiteth for the revelation of the sons of God.

Nam exspectatio creaturae revelationem filiorum Dei exspectat.

[20] For the creature was made subject to vanity, not willingly, but by reason of him that made it subject, in hope:
Vanitati enim creatura subjecta est non volens, sed propter eum, qui subjecit eam in spe :

[21] Because the creature also itself shall be delivered from the servitude of corruption, into the liberty of the glory of the children of God.
quia et ipsa creatura liberabitur a servitute corruptionis in libertatem gloriae filiorum Dei.

[22] For we know that every creature groaneth and travaileth in pain, even till now.
Scimus enim quod omnis creatura ingemiscit, et parturit usque adhuc.


Is it not the tradition of the Church that all of material creation fell with Adam's sin? Upon a simple reading of the texts, one might come away with the idea that all creatures ate herbs before the Fall. If I'm not mistaken, well-known creationist Paula Haigh held to that opinion.

If she is correct, then why the differences in the teeth of carnivores and herbivores? It's hard to conceive that the Fall of man would have caused these kinds of changes in the physical characteristics of animals. Ultimately, I think the guiding principle is that the consequence of the Fall is to throw all of material creation into disorder. The body rebels against the soul, though the soul's rightful dominion is not obliterated. And the creature rebels against man, though his rightful dominion over the earth is not obliterated.