Cats cannot excrete rubber after eating it. Cats eating rubber may be due to lack of trace elements in the body. Long-term consumption will damage the cat’s gastrointestinal tract. You can prepare some egg yolks, beef and other foods for the cat and mix them into the cat food to help the cat supplement. Nutrition. Sometimes cats will vomit out the rubber. If the cat still does not expel the rubber, then you need to take the cat to the pet hospital for vomiting treatment.