Gastrointestinal parasitism of the shrew (roundworms)
Gastrointestinal parasitism by roundworms (nematodes) is a common condition in shrews, whether wild or held in captivity for observation or care. These small worms live in the intestine of the animal and feed at its expense. In small number...
What is it?
Gastrointestinal parasitism by roundworms (nematodes) is a common condition in shrews, whether wild or held in captivity for observation or care.
These small worms live in the intestine of the animal and feed at its expense.
In small numbers, they often go unnoticed. In large numbers, they can seriously weaken an animal already fragile due to its small size and very rapid metabolism.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
The signs are often discreet at first, because the shrew is an animal that easily hides the disease.
We can observe diarrhea, sometimes loose or unusually colored stools.
The animal loses weight while it sometimes continues to eat, or on the contrary it eats less.
The coat becomes dull and less well-groomed.
General fatigue, a stomach that appears swollen or sensitive, and growth retardation in young people may also be noted.
In severe cases, a Dehydration sets in quickly, which is particularly dangerous for this species with a very high metabolism.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The disease is caused by intestinal nematodes (roundworms), a group of internal parasites common in small insectivorous mammals such as the shrew.
The eggs or larvae of these worms are present in the environment, in ingested prey (insects, earthworms) or in the stools of already infested animals.
The shrew becomes infested by feeding or exploring a contaminated environment.
Living in a very humid or crowded environment favors the presence of parasites in the environment.
A diet based on uncontrolled wild prey increases the risk.
Young animals, stressed individuals, injured or already weakened by another disease are more susceptible.
Captive housing with insufficient cleaning promotes the accumulation of parasite eggs.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian makes the diagnosis mainly by examining the stools under a microscope, looking for worm eggs.
A complete clinical examination assesses the general condition, hydration and weight of the animal.
Additional examinations may be offered if the animal's condition requires it, taking into account its size and fragility.
Treatment
Treatment is based on the use of antiparasitics suitable for small mammals, prescribed and dosed only by the veterinarian taking into account the particular sensitivity of this species.
Nutritional support and rehydration may be necessary in parallel, especially if the animal is weakened.
Complete cleaning of the living environment always accompanies the treatment to avoid immediate reinfestation.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Regular and rigorous cleaning of the habitat in captivity greatly limits the risk.
It is preferable to avoid feeding the animal with uncontrolled wild prey.
Regular veterinary control, with examination of stools, makes it possible to detect an infestation before the appearance of serious signs.
Quarantining any new animal before introducing it with others is a good practice.
Possible complications
A large, untreated infestation can lead to severe dehydration, major weight loss and general weakening that can be life-threatening, especially in young individuals.
When to see a veterinarian
The shrew has persistent diarrhea.
It loses weight or refuses to eat.
It seems depressed, less active than usual.
Its coat becomes dull or neglected.
Signs of dehydration appear, such as skin which remains wrinkled after pinching.
Prognosis
The prognosis is generally favorable if the infestation is detected and treated early.
It becomes more reserved if treatment is delayed, because the shrew's small size and rapid metabolism make it vulnerable to rapid weakening.
Frequently asked questions
Can my shrew transmit its worms to me?
Shrew intestinal nematodes are generally specific to this species or to closely related animals. The risk to humans is considered very low, but it is still recommended to wash your hands after any contact with the animal or its bedding.
How do I know if my shrew has worms without taking it to the vet?
There is no reliable way to know this without examining the stool under a microscope. Visible signs, such as diarrhea or weight loss, do not allow us to confirm a diagnosis or choose a suitable treatment.
Should we systematically treat a shrew collected in the wild?
Parasite control is recommended for any shrew collected, even without apparent symptoms, as these wild animals often carry parasites without visible signs at first.
References
ESCCAP — European Scientific Counsel Companion Animal Parasites
Content reviewed by the TunisieVet editorial team · Updated 30 October 2026
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