To dream of a litter box represents your willingness to “pay the cost” to feel good no matter what problems arise. “Putting up with shit” because it’s worth it to you. Extra efforts to keep yourself comfortable or overlooking the dirty aspects of something you like. Consider the type of animal using for additional symbolism.
To dream of a cat’s represents your extra efforts to maintain a comfortable false sense of reality. Your willingness to “pay the cost” or keep cleaning up after whatever problems arise from your unwillingness to face reality. Putting up “someone else’s shit” because lying to yourself feels better.