I’ve posed this question to the folks at AIG, and they said there was no definitive answer as to whether animals preyed on each other between the Fall and post-Flood.
Genesis specifically states that Man can now eat meat after the Flood (and not before), and that (to make it fair, I suppose), animals would now fear Man.
Nothing has teeth like the carnosaurs had for eating apples and oranges. Like I said, the dinosaurs walking around prior to the flood were leftovers and likely did not include any of the dangerous kinds. It seems likely to me that there was an age of dinosaurs which was a fang/claw sort of age, followed by the antediluvian period described in Genesis during which meat was not eaten, followed by what you read after the flood.