A noise an animal makes, such as a dog bark or a rooster crow, can represent:
A traditional or cultural meaning of that sound or that animal, such as a rooster crow representing dawn or morning
The animal that makes that sound, or its characteristics
The situation or feeling associated with the particular sound, such as a dog's wimper representing sadness or an unmet need
A particular meaning you associate with that specific sound based on your experience or animals you've been around in the past, such as a sheep baa-ing representing your recent trip to Scotland