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"simmer.15;c-16373891" wrote:
What does the pillow thought bubble mean? My pet keeps showing this one but there is never anything wrong with it.

The pillow means they are tired and can't find somewhere to sleep. You either need to encourage them to sleep in a pet bed by calling them to it, or praise them for sleeping on furniture. If you do neither then they might not know where they are supposed to sleep and will likely pass out somewhere.