My girl, Nitosha had litter stuck in her stomach about a year ago. Since she was 15 at that time we gave a ton of petromalt (like vaseline) to coat her stomach to help the litter slide out as well as perscription med. Thank goodness she is better and I switched to a brand called Pestal. It's cheap, does clump but does NOT contain silica which is the ingredient that clumps the litter. Pestal is also dust free and very very little, like dirt best part is it is biogradable in the stomach. She has been do very well with ths litter and i will never switch.