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Answer:
Regarding your first question, the consequences of original sin apply to humanity, not non-human beings, as we note in a previous answer addressing how death prevailed on Earth before the creation of man (cf. Rom. 5:12-13). For further reading on this subject, see also this Catholic Answers analysis by Matt Fradd and a related post by Jimmy Akin.
In short, man’s fall didn’t change animals’ God-given nature which, unlike man, was not and is not immortal. In addition, making all animals plant eaters would not preclude their sustenance via the death and digestion of other created and animate beings, namely, fruits and vegetables. It’s just that human beings generally have a higher regard for animals than fruits and vegetables, given that animals are fellow sentient beings and thus subject to pain.
Only man is made in the image and likeness of God (see Gen. 1:26-27), not animals or fruits and vegetables. The latter were created for man’s sustenance and so, while all of God’s creation should be respected (see CCC 2415ff.), we should not fall into the error of exalting non-human beings to a status that God did not give them.
For further information on the important differences between man and other living beings, see this previously answered Catholic Answers question on the differences between their respective souls.