Make sure your cat is constipated versus having a urinary tract problem. Check and see if the cat is urinating but is not having bowel, decreased bowel or painful or strained bowel movements, then your cat may be constipated. A UTI or a stone in the urinary tract requires immediate attention. Digestive indicators beyond bowel movements include not eating, vomiting, diarrhea.
Constipation may be the result of: not enough fluids, a dirty litter box, hairballs or eating something, medication, parasites,and lack of activity. Putting a little pumpkin (without spices) in with its food may help. Megacolon cats are often treated with high fiber diets. Most cats go once or twice a day, if it is every 2-4 days, your cat is probably constipated. This can cause dehydration so make sure your cat is getting water. Do not use human enemas on cats as they are toxic. See your vet or call them if the condition lasts more than a day.