How often should I completely change the litter in my litter box?

Dr. Elsey’s recommends completely changing the litter in your box every 4 weeks if you are using a clumping clay litter. Be sure to remove the clumps daily and top off with fresh litter to maintain a three-inch level.  

For non-clumping litter, we recommend changing the litter box every 7-10 days.