If your cat seems tired, if it has a fever, refuses to eat, vomits, or has a swollen or painful stomach, it is better to consult your veterinarian. This is also the case if you cat has been constipated for several days. Your veterinarian will examine your companion and probably propose examinations, such as x-rays, scans, or blood tests. He or she will advise you on an appropriate diet and discuss the role of fibers, notably psyllium.
