Fleas can be difficult to detect, but there are a few things you can do to check for them. One way is to look for evidence of them in your couch: flea feces, eggs, or cocoons. If you find any of these, it's likely that your couch has fleas. Another way to check for fleas is to place some food on the ground near your couch and see if any fleas jump onto it. If so, your couch is likely infested.