Our litter box is twice as big as our bathroom. My wife is too busy with the baby to scoop it, so I have to, but it's all poop and no litter.
This dream may symbolize feelings of overwhelm and responsibility in your waking life. The oversized litter box could represent a task or situation that feels larger than you can handle, and the abundance of poop without litter could signify a sense of being surrounded by negativity or unpleasantness without any relief or respite. Your wife being preoccupied with the baby may indicate feelings of being burdened or left to manage difficult situations on your own. It could be a reflection of needing support or help in dealing with challenging issues in your life.