If there is only a small amount of excrement left in the litter box, and the litter itself remains dry and clean, you don't need to empty it all. Simply clean out the contaminated litter and excrement, and then add an appropriate amount of new litter.
However, if most of the litter in the litter box is contaminated, or if the litter box has not been thoroughly cleaned for a long time, it is recommended to empty all the old litter and thoroughly clean and disinfect the litter box to ensure the health of the cat and the hygiene of the living environment.
