Plural Noun Example: "Cats" and "Dogs"

Which of the following sentences is grammatically correct?

1. The cat's purrs are loud as the dog's barks.

2. The cat's purrs are loud as the dog's barks are.

Which of the following sentences is grammatically correct?

1. The cats purrs are loud as the dog barks.

2. The cats' purrs are loud as the dogs barks.

Choose wisely, human.

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