sentience is defined as the ability to feel sensations – such as pain and fear – and have a sense of well-being. The animals that you’ve mentioned (cats, dogs and birds) are all sentient beings.
there’s pretty good evidence that some other animals are “aware of their own existence”. Elephants for example can recognise themselves in mirrors (as themselves rather than just another elephant). However its hard enough to understand how other people experience the world, let alone other species.
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