Kitten Constipation: Causes, Safe Home Care and When to Worry

By Tailwisp Editorial TeamUpdated October 20, 20264 min read

Kitten stool should be easy to pass and regular. When a kitten strains, cries in the litter box or produces nothing for a day or two, owners worry. Constipation is common, but in tiny kittens it can mask other problems, so it deserves attention.

What is normal?

Most kittens pass stool once or twice a day. Frequency varies with diet and age. Kittens on milk replacer may go less than those eating solid food. Stool should be formed, moist and brown. Hard, dry pellets, or no stool for over twenty-four to forty-eight hours, is a concern.

Signs of constipation

• Straining in the litter box, with little or no stool.
• Small, hard, dry stool.
• Crying or discomfort when trying.
• Reduced appetite.
• Vomiting.
• A firm, swollen belly.
• Lethargy.
• Visiting the box often without results.

Straining with little urine may be a urinary problem, not constipation. See signs of a urinary blockage in cats.

Causes

• Dehydration. Not drinking enough, or illness.
• Diet change. Sudden switches, or low-moisture diets.
• Lack of stimulation in orphan kittens. See how to stimulate a kitten to pee and poop.
• Formula problems, such as overly concentrated or wrong formula.
• Swallowed hair, string or objects. See linear foreign body in cats.
• Intestinal parasites. See kitten deworming guide.
• Stress or litter box problems.
• Medications.
• Congenital abnormalities, such as narrowed colon, or problems with the anus, tail or spine.
• Megacolon, rarely in kittens. See megacolon in cats.

See constipation in cats.

What to do at home

Only if your kitten is bright, eating and not in distress:

1. Offer fluids. Fresh water, and wet food. See how to get a cat to drink more water.
2. Check the litter box. Keep it clean, accessible and quiet. See kitten litter training.
3. Review food and formula. Make sure it is diluted correctly.
4. Warm the belly gently, and encourage movement through play.
5. Call your vet if no stool within a day.

For orphans, continue stimulation after every feeding.

What not to do

• Do not give laxatives, mineral oil, enemas or suppositories unless your vet instructs, since they can be dangerous. Mineral oil can cause pneumonia if inhaled. Human enemas can be fatal to cats.
• Do not give human medicines.
• Do not force fluids.
• Do not try to remove stool manually.
• Do not wait too long.

When it is an emergency

Go to a vet urgently for:

• Repeated vomiting.
• A hard, painful belly.
• Lethargy, weakness or collapse.
• No stool for more than two days.
• Straining with little or no urine.
• Blood.
• Fever.
• A very young kitten or a sick kitten.

What your vet may do

Examine, palpate the belly, X-ray, check for blockages, parasites and anatomical defects, give fluids and, if appropriate, use enemas and safe medications. They may suggest diet changes.

Prevention

• Ensure adequate fluids and moisture.
• Keep diet consistent, and switch slowly. See how to switch cat foods.
• Deworm. See kitten vaccine schedule and core shots.
• Keep the litter box clean.
• Supervise play to avoid ingesting hazards. See kitten toys safe and unsafe.
• Keep a record of stool.

Diet and hydration tips

Wet food adds moisture and helps stools stay soft. Offer a shallow bowl of fresh water, and consider a small water fountain once the kitten is old enough. Introduce changes slowly. Avoid adding fiber supplements without advice, since too much fiber can worsen the problem when a kitten is dehydrated. If your kitten is on milk replacer, make sure the mixing is correct, and consider whether the formula suits it.

Monitoring

Keep a note of stool frequency and appearance. Photos help your vet. A kitten that returns to normal, active behavior and passes regular, soft stool is improving. If problems recur, ask your vet to investigate causes, rather than treating each episode at home.

Frequently asked questions

Is one missed day an emergency? Not usually in an eating, active kitten, but call if it continues. Can stress cause it? Yes, moving, travel and litter changes can. Does grass or hair cause it? Hair is more of a problem in long-haired adults, but kittens do swallow fur and objects. Will it come back? If a cause is found and treated, often not. Repeated episodes need a vet to look for deeper problems.

When to see a vet

See a vet if your kitten strains or has not passed stool for a day or two. Use the US vet directory to find a clinic.