Purchase a new litter tray and place the new brand of litter in the brand new tray. Then put the new box along side the old one.
When the cat begins to use the new litter tray, you can begin to switch the trays around. If you see that the cat starts to use the new one once or twice but uses the old one more frequently, do not change the litter over! Your cat may not want to use it.
Other folks may suggest what's best to do with changing your cats litter. They may say to lightly mix the litter from the old one to the new one until the change is complete. Personally, I think this is a bad move. Cats are very intelligent creatures.
Here's Why That Is a Very Bad Move:
If the cat doesn't like the new litter, they may accept it at first. Having a little bit of it in their litter tray may be fine. However, when the litter has been mixed half and half with the other litter, the cat can just refuse to use the litter tray. When this happens and there is no other way to do their business, you will be left cleaning the carpet.
If the old litter is the same or similar to the new one, the idea may work.
However, it could be as simple a thing as a hit and miss method; the cat might not care and just starts using the new one. But, if you get it wrong, the cat won't be using any litter tray and just use the floor.
What I would recommend, if you have to trade litter, is that you mix the new and old litters together in stages until it's all transferred over rather than change completely to a new one. Wait until you are happy that the cat will start using the new litter.
The simple reason is that the cat won't like a change of litter one bit even when it was placed next to the old one. Mixing it in stages may not put the cat off so much.
If you have been using bin liners over the tray, under the litter, get rid of them.
Cats don't like them because claws can get stuck when they start to dig and they make a noise. Also, liners for the litter tray will actually make the litter tray smell even worse because little puddles of urine will end up in the creases of the liner.
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