Hi,
Couple of clarifications on some of the posts. Pineapple juice is sometimes used in stasis situations. There is no clinical evidence that it works...but I have used it successfully many times. It does seem to have some beneficial effect on the mucus that binds impactions. The key is to use fresh juice squeezed directly from the fruit. No canned, bottled or concentrate...or any processed juice...it has to be fresh.
Parasites are certainly a possibility. Fecals are notoriously inaccurate due to the shedding cycles of the parasites. If I have any concern with worms, I deworm them. Coccidia usually comes with a strong odor that you would smell...usually. Coccidia is seen easily under a microscope....they look like "fried eggs". Treatment is usually with a suflanomide....the drugs help but usually it's the immune system that will take care of coccidia.
A probiotic would certainly be helpful. Most pet stores or vet clinics carry some type of probiotic. Bene-Bac contains the most effective strains of bacteria including L Acidophilis, L Casei and Enterococcus. The idea isn't so much the strain of bactera....but the acidification and stabilization of the pH. In a pinch, use can use non-dairy acidophilis powder that can be found at most health food stores. There are many sites that still promote an old school treatment....using yogurt. DO NOT use yogurt regardless of any article you may read. This is from a time in which the dynamics of a rabbit gut were not clearly misunderstoos....at that time, it was thought a rabbit and cat should be treated alike.
Randy