Cats can eat pineapple, but only as a very occasional treat. Pineapple is not toxic to cats, but it is high in sugar and provides no essential nutrition for them. Since cats are obligate carnivores, they do not need fruits or vegetables in their diet. Fresh, natural pineapple without skin or spikes can be given in small pieces, but canned pineapple or pineapple with added syrup should be avoided. It's also important to monitor the cat for any digestive issues like vomiting or diarrhea after eating pineapple. Overall, pineapple can be an occasional treat but should not be a regular part of a cat's diet.