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Cat Constipation and Treatment

Updated on April 24, 2016

Cat constipation very often can be mistaken for an overlooked bladder outlet obstruction due to the straining that takes place in both instances. For this reason, a clear distinction must be made before treating the cat for constipation.

Basically, constipation is defined as a condition of the bowels in which the feces are dry and hardened and evacuation is difficult and infrequent. There can be an obstructed passage and there is an element of pain during defecation. A cat who continuously strains but is unable to pass stool is probably constipated. However, straining also occurs with colitis and Feline Urinary syndrome (FUS). (FUS is discussed further in Cat Urinary Problems)

The most common causes of cat constipation are a poor or incorrect diet and lack of exercise. Commonly, cats have one or two stools per day, while others may go for a few days before having a bowel movement. The cats that wait longer might have more difficulty passing their stools.

A frequent cause of dietary constipation occurs with many feral cats who eat undigestible parts of birds or rodents. This slows down the movement through the bowel and produces hard feces held together by hair, bone and feathers. If you have an outdoor cat who participates in this sport, these type of fecal concretions might need to be broken down with forceps and removed by enemas.

Concentrated high meat diets produce dark, tenacious, small gummy stools. Due to their lack of volume and consistency, they are difficult to pass. In addition, the intake of water among cats is generally low compared to most other animals. This can add to the problems. Also, cats that eat canned food, which is 75% water, may not feel the need to drink for several days.

Diets low in fiber also cause the stools to be of small caliber.Older less active cats experience reduced bowel activity and have weakness of their abdominal wall muscles. Both these conditions can lead to prolonged retention and an increase in the hardness of the stool.

Other common causes of hard stool and constipation are hairballs, grass, cellulose, paper and cloth. Hairballs can be prevented with certain dry diet mixes on the market or with a product called Petromalt (found in most pet food stores).

Very rarely, there is a case of chronic constipation due to an enlarged, sluggish, poorly contracting colon. This condition is called Megacolon. These cats require life-long treatment with stool softeners and special diets, and should regularly be supervised by a veterinarian. A chronically constipated cat may have a bloated look, seem lethargic and pick at his food. Cats with impactions often pass blood-tinged or watery-brown stool. This might be mistaken for diarrhea, but what is actually happening is that liquid stool is being forced around the blockage. If you suspect a fecal impaction confirm this by digital examination using a well lubricated glove.

There are several treatments for cat constipation that do not necessarily require veterinary supervision. In the case of enemas, support of another person, to restrain the animal might be necessary.

--- A change in diet may relieve the problem, especially if you are using canned food as a major part of the diet. Dry food has a higher fiber content and adds more bulk to the stool. If you are already using dry food, switch to another product to see if it makes the stools softer. In the older cat with an inactive bowel, soaking the food with equal parts of water can aid him greatly. Let the mixture stand for twenty minutes before feeding. Increasing his activity and exercise, if possible, will also help.

--- Small hard stools can be made softer with a stool softener such as Colace. This medication comes in drops or syrup and is added directly to the meal. Use the pediatric size dose.

--- An episode of mild constipation can be treated with a laxative such as Milk of Magnesia. The usual dose is two to three teaspoons per day. Do not use laxatives regularly unless instructed to do so by a vet. Instead use liver or milk which has a laxative effect.

--- A fecal impaction requires an enema. Enemas are given at the rate of one ounce per ten pounds of body weight.

--- Tap water enemas are given through a rubber catheter connected to an enema bag. Lubricate the tip and insert it far into the anal canal so the rectum retains the fluid. One or two inches is enough. Otherwise, if the cat struggles, the catheter could injure the wall of his rectum.

Cat constipation in the kitten occurs less frequently than in an adult cat. The kitten that is hand fed needs to have their abdominal and perineal areas massaged with a wad of cotton soaked in warm water after each feeding to stimulate the elimination reflex. If the kitten is constipated, a warm soap-water enema can be given by eye dropper (2 or 3 dropper-fulls after feeding). Alternately, you can give mineral oil or Milk of Magnesia (3 drops per ounce body weight) by mouth. You must use extreme caution when doing this to avoid aspiration into the lungs.. If you are feeding a formula containing syrup, give dark syrup which has a laxative effect, instead of white syrup or honey.

References: The Cat Owner's Home Veterinary Handbook by Delbert G. Carlson, D.V.M and James M. Giffin, M.D.

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    • hglick profile imageAUTHOR


      9 years ago from Ronkonkoma, NY

      Thank you stars

    • stars439 profile image


      9 years ago from Louisiana, The Magnolia and Pelican State.

      very interesting and informative. i must stay ahead of the game to keep our cats healthy. one of our cats just took the phone off the hook. we have ten cats. god bless. thanks.

    • hglick profile imageAUTHOR


      9 years ago from Ronkonkoma, NY

      Thank You BJC Happy cat sitting

    • BJC profile image


      9 years ago from Florida

      Very informative. We have two cats and one of them is a Pixie Bob (actually he belongs to my daughter and I'm cat sitting...) So, yes, great article.


    • hglick profile imageAUTHOR


      9 years ago from Ronkonkoma, NY

      Thank You for the post Sufidreamer. Yes, olive oil is especially helpful for a healthy coat in a cat.

    • Sufidreamer profile image


      9 years ago from Sparti, Greece

      Very useful Hub - modern foods can be very bad for cats.

      We have one cat with a disability and we suspect that his bowel is constricted. He loves olives and olive oil - perhaps he is self-medicating.

      Thanks for the info - I know where to look when we need cat-related advice!


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