Intussusceptions generally occur as a secondary problem to some disorder or disease that causes increased intestinal mobility
or inflammation. There are times when intussusceptions occur for no apparent reason, so it is likely that primary intussusception
can occur. Many disorders can cause intussusceptions, and many other diseases/disorders have the same signs. These include:
Image 5 and Image 6.
- Viral enteritis, specifically canine parvovirus enteritis, can either contribute to the formation of an intussusception, or
mimic its clinical picture. The most common signs associated with canine parvovirus enteritis are vomiting, diarrhea (often
with blood), inappetence and dehydration.
- Bacterial enteritis, inflammation/infection of the intestinal tract with Salmonella, Clostridium and other bacterial species,
is commonly associated with signs similar to those associated with intussusceptions.
- Chronic parasite infection, such as roundworms, hookworms and whipworms, may contribute to the formation of an intussusception
or cause similar signs.
- Gastrointestinal foreign bodies, due to their ability to cause irritation and an obstruction, often present for similar signs.
- Hemorrhagic gastroenteritis (HGE) in dogs is characterized by the acute (sudden) onset of bloody diarrhea, usually explosive,
accompanied by high packed cell volumes.
- Mesenteric volvulus is seen in dogs (most commonly, German Shepherds), where the tissue that connects abdominal organs to
the body wall twists upon itself, causing severe and devastating clinical illness and death.
- Gastroesophageal intussusception is when the stomach slides up through the esophagus, causing signs that need to be differentiated
from an intussusception lower in the intestinal tract.
- Gastrointestinal masses (tumors) can cause an obstruction of the intestinal tract either due to their physical presence or
by predisposing the animal to an intussusception.
- Hypoadrenocorticism may cause signs similar to those with a partial intussusception, such as vomiting, diarrhea, weakness
- Animals with other metabolic disorders, such as kidney failure or liver disease, may have vomiting, diarrhea and a host of
gastrointestinal signs that initially may need to be ruled out.
- Pancreatitis often has a combination of vomiting, inappetence and/or bloody diarrhea.
Intussusceptions can occur anywhere throughout the gastrointestinal tract, and depending on their location, the type and degree
of clinical signs may vary.
Intussusception occurs when a segment of intestine overrides another segment, trapping it inside in a telescoping effect.
This cuts off the circulation to the sucked up segment of intestine and it dies if the situation is not relieved. The dead
segment of intestine then leads to the death of the affected dog as infection and shock occur.
Image 7 and Image 8.
In general, when the blockage is high in the gastrointestinal tract, the signs are often most severe and life threatening.
Some signs may include vomiting, vomiting blood, anorexia, depression, bloody diarrhea and abdominal pain. Signs may progress
rapidly and become severe within a few hours. Signs of shock, collapse and sudden death do occur. Intussusception can sometimes
be chronic. It can also be a "come and go" problem.
Intussusceptions occasionally may resolve on their own and then recur. It is possible to remove an intussusception surgically,
put the remaining intestinal ends back together, and watch a new intussusception form right at the same site.
Diagnosis may include:
- A complete blood count (CBC), serum chemistry profile, urinalysis and fecal examination.
- Thoracic and abdominal radiographs to eliminate a foreign body or other disease process.
- Abdominal ultrasound study
- Upper gastrointestinal contrast study
- Endoscopy of the gastrointestinal tract.
Abdominal ultrasonography is an accurate method for the diagnosis of intestinal intussusception in dogs. The ultrasonographic
appearance of intussusception varies. The target-like mass with hyperechoic or anechoic core surrounded by concentric rings
in transverse segments and hyperechoic and hypoechoic parallel lines. Tumor-like or kidney-like mass and trident-like configuration
in longitudinal segments is seen.