This article is from the Rat Health Care booklet. Order one today! Check out the info at Rat Books
By Debbie “The Rat Lady” Ducommun
most common cause of a bloated-looking abdomen in young female rats is
pregnancy! The next most common
cause is megacolon, and much more rarely, another congenital problem or a
bacterial or viral infection.
most common cause of bloating in an adult rat is a tumor in the abdomen. Not only can the tumor cause a bulge in
the abdomen, but it can also cause fluid to accumulate in the abdomen. Liver and kidney disease can also cause
fluid to build up in the abdomen.
rat with respiratory distress can swallow a lot of air, which she can’t
burp up, causing stomach distension.
(See Other Treatments under Respiratory Disease for how to relieve the
the abdomen is soft, it may be possible to feel if there is a tumor. (See Health Exam.) However, some tumors
are so soft they can’t be distinguished from normal organs. If the abdomen is tight and hard because
of fluid pressure, fluid can be removed from the abdomen by needle aspiration
to relieve the pressure. This will
then allow palpitation for a tumor, and will also make the rat more
in the abdomen can sometimes be successfully removed surgically, but in many
cases, if the rat cannot be kept comfortable, euthanasia is the only choice.
is a condition where the nerves to the large intestine don’t work well
and so the colon has trouble pushing out feces. This causes the colon to become backed
up, and both the colon and the stools become larger than normal. Because the stools remain in the
intestines longer than normal they can also become drier than normal and this
also contributes to the problem.
However, diarrhea can also occur.
It’s a fairly common problem in rats, usually genetic, and
particularly common in black-eyed white rats and rats with only small spots of
color on a white background (rats with the restricted spotting gene), and
sometimes in rats with a blaze. (Notice all the rats in the pictures have these
color patterns.) There is no
condition usually appears in rats 4-6 weeks of age and causes bloating, but can
occasionally be found in rats a few months old. In older rats, the colon can sometimes
feel like two firm masses on either side of the lower abdomen.
is a 4-week-old rat with megacolon.
These pictures show a 6-month-old rat with megacolon.
pictures of autopsies of rats with megacolon click here.
seems that different rats can have the problem to varying degrees. If a rat has some mobility of the large
intestines, then treatment can be successful. In a rat with little or no peristalsis,
treatment may have only limited success. I know of 4 rats with megacolon who
were successfully treated. I treated one boy with partial success until he died
of complications at the age of 9 months. I also tried treating a younger cousin
of his who died of complications at 7 weeks of age. I’ve also seen two 4-week-old
babies who were so bad they had to be euthanized.
treatment consists of a natural vegetable laxative called Senekot and magnesium
as a stool softener to reduce the chance of a blockage. The suggested dose for
the Senekot is 1/8 tablet/lb twice a day with food. Try giving the magnesium 10-29 mg/lb twice a day,
adjusting the dose until the stools are fairly soft. It’s also important
to make sure the patient takes in lots of fluids and fiber by offering lots of
fresh foods. Prunes can be helpful. My homemade diet is very helpful. If giving
rat blocks, try soaking them in water.
home treatment isn’t enough, ask your vet for a drug called cisapride,
which is available from compounding pharmacists. Cisapride assists the colon in pushing things along. It is best to give the cisapride on an
empty stomach, at least 1 hour before or 2 hours after a meal. The suggested dose for the Senekot is
1/8 tablet/lb once a day. This can be given with food.
is usually also necessary to help the rat have bowel movements. The colon, which runs along the spine
from under the ribs to the anus, can be squeezed from side to side “like
a tube of toothpaste” from top to bottom to help push things along. It may also be necessary to pinch the
area just under the tail to help feces come out of the anus. A sliver of a suppository can also be
inserted into the anus.
squeeze out the colon on a rat with megacolon.
possible cause of a rat who looks bloated is an overfilled urinary bladder,
which will feel like a balloon in the center lower abdomen. Normally the bladder will only be
½" across or less, but if blocked can become 2" across. This is an emergency. A veterinarian can suck out some of the
urine with a needle and syringe to make your rat more comfortable, and do a
urinalysis to try to figure out the cause of the blockage.
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