Pancreatitis in dogs: symptoms, tests and treatment

Overview

The pancreas produces enzymes that help break down food in the small intestine. It also produces insulin to regulate blood glucose. Pancreatitis can be acute or chronic. Chronic pancreatitis leaves permanent tissue changes such as scarring and pancreatic cell atrophy.

Long-term inflammation may have symptom-free periods before becoming active again. Symptoms alone cannot reliably distinguish acute from chronic disease. In a US hospital follow-up of 504 dogs, median age was ten years. Acute pancreatitis was a suspected or probable diagnosis in these patients.

Tissue changes from acute inflammation can reverse if pancreatic damage heals. An acute episode can also develop in a pancreas with existing chronic damage.

The pancreas lies on the right side of the abdomen near the stomach. Mild acute disease may mainly cause swelling of pancreatic tissue.

Causes

The precise cause remains unknown in most cases. Digestive enzyme precursors normally travel through the pancreatic duct into the duodenum. With pancreatitis, some enzymes may activate too early within the pancreas. Premature activation can damage the organ's own tissue.

White blood cells accumulate in the affected area and participate in inflammation. Inflammatory signalling substances can travel beyond the pancreas in the bloodstream. A strong blunt blow to the abdomen can trigger pancreatitis. In some dogs, reduced pancreatic blood flow during anaesthesia may be responsible. An autoimmune-associated form of chronic pancreatitis is suspected in English Cocker Spaniels.

Pancreatic fluid secretion may decrease early in inflammation. Disease development also involves mechanisms independent of premature trypsin activation.

Trypsin can activate further digestive enzyme precursors within the pancreas. Chronic tissue changes may include accumulated lymphocytes and plasma cells.

Risk factors

Miniature Schnauzers have been overrepresented among pancreatitis patients. Yorkshire Terriers have also been affected more often than usual. Cushing's disease, or hyperadrenocorticism, is a risk factor.

Eating table scraps or rubbish has been associated with increased risk. Obesity may also be associated with increased susceptibility. High blood calcium can be a predisposing factor. Acute pancreatitis can also occur in a dog with diabetes. High-fat, low-protein food has been suspected as a risk factor, but evidence of a direct link is insufficient.

Potassium bromide is among medicines considered possible predisposing factors. Very high blood triglycerides, at least 500 milligrams per decilitre, are a particular risk factor.

Typical symptoms

Mild pancreatitis may mainly cause increased tiredness. A severely affected dog may have several digestive symptoms and dehydration at once.

• Sudden, severe vomiting.
• Loss of appetite.
• Abdominal tenderness when touched.
• Weakness and withdrawal.
• Diarrhoea alongside vomiting.
• Fever in some dogs.

Abdominal pain may cause a prayer position, with the forequarters lowered and hindquarters raised. Pain can also show as abdominal tensing during ultrasound examination. In one follow-up of 38 dogs with suspected acute pancreatitis, 53% vomited.

In the same group of 38, loss of appetite was recorded in 66%. Abdominal pain was recorded in 16%.

A nauseous dog may drool, lip-smack or swallow repeatedly. A hunched posture can indicate abdominal pain.

Complications and consequences

Acute inflammation can cause pancreatic tissue death. Fluid can accumulate around the pancreas. Inflammation can also damage surrounding fat. Severe pancreatitis can cause kidney failure.

Severe inflammation can disrupt blood clotting. Long-term damage can cause digestive enzyme deficiency, or exocrine pancreatic insufficiency. Chronic pancreatic damage can also predispose to diabetes. In the US hospital follow-up of 504 dogs, 8.8% died or were euthanased during the pancreatitis episode.

Severe pancreatitis can lower blood pressure. Low blood calcium may be associated with severe inflammation and a poorer outlook. The outlook for mild pancreatitis is generally good.

Severe tissue damage can involve bleeding from the pancreas or into the surrounding area. Respiratory failure in severe disease may indicate inflammatory effects on the lungs. Nearby bile ducts can be damaged by inflammation.

Diagnosis at the vet

Pancreas-specific lipase and other blood tests

The vet assesses symptoms, examination findings, imaging and blood pancreatic lipase together. A blood count and other tests help assess complications and concurrent disease. Routine amylase measurement has limited usefulness in canine pancreatitis investigation. Canine pancreatic lipase immunoreactivity, or cPLI, specifically detects pancreatic lipase in blood.

A positive rapid pancreas-specific lipase test can be followed by laboratory concentration measurement. With the quantitative cPLI method, a result of 200 micrograms per litre or less is within that method's reference range. A result of 201–399 micrograms per litre is borderline and may warrant retesting after two to three weeks. A result of at least 400 micrograms per litre supports pancreatitis if other findings fit.

Secondary pancreatic injury during another disease can also increase lipase. With atypical symptoms, an elevated cPL concentration can be rechecked after 10–14 days.

Ultrasound and investigating other causes

Abdominal X-rays can look for a foreign body or another cause potentially needing surgery. Ultrasound may show an enlarged, darker-than-usual pancreas. Surrounding fat may appear brighter. Findings depend on the stage at which imaging is performed.

An initially normal scan can be repeated if symptoms and blood results maintain strong suspicion. In follow-up, 14 of 38 dogs showed strongly suggestive ultrasound changes only on repeat examination. Repeat imaging occurred 40–52 hours after the first scan. A localised lesion may be missed if fine-needle sampling reaches a healthier area.

Nodular pancreatic hyperplasia can alter ultrasound appearance and resemble inflammation. Ultrasound changes can also remain after the original injury.

Intestinal obstruction can cause similar symptoms, and identifying it may change treatment urgency. Inflammatory cells alongside enzyme-secreting pancreatic cells in a fine-needle sample support pancreatitis. CT or MRI can sometimes investigate a local lesion.

Treatment

Fluids, pain and nausea

The vet prescribes treatment according to symptoms and severity. A mildly affected dog may recover as an outpatient with agreed follow-up visits. Severe inflammation often requires hospital care and intravenous fluids. Fluid planning includes ongoing losses through vomiting or diarrhoea.

The vet may give an opioid for abdominal pain. Anti-nausea medication can help an inappetent dog even without vomiting. Antibiotics are not routinely used for pancreatitis. A bacterially infected fluid collection associated with the pancreas is a rare indication for antibiotics. Such a collection may also need surgery.

A dog in shock or with severe haemorrhagic pancreatitis may need intensive care. Pain assessment considers small behavioural changes because abdominal pain is not always obvious. Pancreatitis does not usually require acid-suppressing medication without a separate indication.

Early feeding

Feeding is started early when the dog's condition allows. A tube passed through the nose can provide nutrition if the dog does not eat independently. Enteral feeding may need delaying if severe vomiting continues despite anti-nausea medication. Small portions of easily digestible, low-fat food may be given during recovery.

A fat-restricted recovery diet may aim for less than 20 g of fat per 1,000 kilocalories.

Recovery and follow-up

In the US study of 504 dogs, median hospital stay was four days. The interquartile range was two to six days. In the same study, 39.0% stayed for at least five days.

Repeat pancreatic lipase measurement can monitor clinical improvement when needed. If chronic inflammation persists despite supportive care, the vet may consider immunosuppressive medication in an individual case.

Prevention

Prevent access to table scraps and rubbish, as eating them has been associated with pancreatitis. Avoid particularly fatty treats such as ham fat, especially after pancreatitis. A low-fat diet may form part of treatment for elevated triglycerides. With recurrent inflammation, treating an identified predisposing factor may reduce further episodes.

In recurrent episodes, the vet may investigate a treatable hormonal disease. If a low-fat diet has been prescribed for triglyceride control, fat is also restricted in treats and chews.

Important for dog owners

Tell the vet about current medicines and access to rubbish or unusual food. If your dog can drink and the abdomen is not clearly painful, you can offer small amounts of water while awaiting the practice's advice. Follow the prescribed low-fat recovery diet when choosing treats too. Contact the vet if vomiting returns or your dog stops eating during recovery.

Report weight loss after repeated pancreatitis episodes at follow-up, as digestive function may need investigation. Symptoms recurring after a dietary change may warrant reassessing fat content.

Contact emergency care immediately if you suspect a swallowed foreign body.

Frequently asked questions

Can a dog have pancreatitis without vomiting?

Mild pancreatitis may cause only reduced appetite, tiredness or diarrhoea. Chronic inflammation can also be entirely symptom-free between episodes. The vet assesses when pancreatic lipase testing and imaging are needed.

Does elevated pancreatic lipase always mean pancreatitis?

An increased result can support diagnosis if symptoms and imaging fit. Pancreatic injury associated with another disease can also raise it. A borderline pancreas-specific lipase result can be checked with another sample if uncertainty remains.

Should a dog with pancreatitis fast?

Feeding often starts early as part of care once the dog can receive nutrition. Severe vomiting can delay it if vomiting continues despite anti-nausea medication. A feeding tube may be considered if the dog will not eat.

How long will my dog need to stay in hospital?

This depends on condition and symptom severity. In the US follow-up of 504 dogs, median stay was four days. In that study, 39.0% stayed for five days or longer.

Can pancreatitis recur?

Some dogs have further episodes after acute pancreatitis. Treating an identified predisposing factor may reduce recurrence risk. Elevated circulating triglycerides are one factor assessed.