Cat using Dog's Litter Box!

Hello everyone,

I have had a small dog that has been using a litter box (specially made for dogs) for almost 10 years. The litter is made of recycled newspaper (like "Yesterday's News", but a little bigger).
A few months ago I started fostering a cat (she is almost 2 years old now), and she had been very good using her little box. I clean it several times a day, and the litter is very good quality (Nature's Miracle clumping litter).
Lately, though, the cat has been using the dog's litter box. It is a problem because it does not have a dome, filter, etc, and the smell goes all over the apartment (I live in a studio). Besides, now the dog does not want to use his own box, which is a problem, since he is not used to "holding it" until I am back from work.
I would like to have the cat using her box again. Any suggestions?
Thanks!
Eliana

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