How do I get the smell of cat litter out of a couch?

My dog went through a phase of eating cat litter on the couch so now it stinks. So the couch smells like cat and cat urine. Every time she would try to eat litter on the couch we’d immediately clean it off but after so many times I guess the smell decided to stay. There were never any wet urine stains on the couch... show more My dog went through a phase of eating cat litter on the couch so now it stinks. So the couch smells like cat and cat urine. Every time she would try to eat litter on the couch we’d immediately clean it off but after so many times I guess the smell decided to stay. There were never any wet urine stains on the couch just litter.
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