What is protein-losing enteropathy?

Protein-losing enteropathy is a condition in which the intestines lose excessive amounts of blood proteins, causing a drop in blood protein levels. Clinical signs can include diarrhea, weight loss, and ascites. If you are concerned, please consult your veterinarian.

What tests will the vet run to confirm the diagnosis?

Common tests include a blood count, biochemistry panel, fecal examination, abdominal ultrasound, and X-rays. When necessary, advanced imaging or tissue biopsy may be arranged to identify the underlying cause.

What can I observe at home to prepare for the vet visit?

Monitor and record appetite, frequency of vomiting and diarrhea, body weight changes, and breathing. Photograph stools or bring a sample — this information will help the vet make a diagnosis.

Does my pet need long-term monitoring or follow-up visits?

Regular monitoring of blood protein levels, liver and kidney function, and clinical signs is usually required. Treatment needs to be adjusted based on response, so please schedule follow-up appointments as recommended by your vet.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Protein-Losing Enteropathy in Dogs & Cats: Diarrhea, Weight Loss & Care Guide [2025]

Excessive protein loss from the intestines requiring specialized dietary management

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: ACVIM, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Obvious difficulty breathing, open-mouth breathing, or gasping
•Collapse, severe lethargy, or loss of consciousness
•Gums or lips suddenly turning purple or very pale

Schedule a Clinic Visit Soon (Within 24–72 Hours)

•Persistent diarrhea lasting more than two days accompanied by decreased appetite
•Noticeable weight loss or wasting in a short period of time
•Visibly distended abdomen or fluid-like sensation upon palpation

01What symptoms indicate something is wrong?

Protein-losing enteropathy often presents with a combination of gastrointestinal and systemic signs. It can lead to loss of blood proteins and nutritional deficits, making early evaluation and monitoring essential.

Lethargy or noticeably reduced activity level
Repeated vomiting or difficulty swallowing
Frequent diarrhea or stools with blood, abnormal shape, or color
Significant weight loss or visible muscle wasting over a short period
Abdominal distension or a fluid-filled sensation on palpation
Changes in breathing or shortness of breath also warrant assessment

Seek emergency care immediately if you notice the following symptoms:

⚠️ Obvious difficulty breathing or inability to breathe normally
⚠️ Collapse, seizures, or altered consciousness
⚠️ Purple or very pale gums

02How should you assess the situation at home? Key observations and emergency criteria

Observing and recording key information at home helps your veterinarian quickly understand the condition and arrange appropriate diagnostics.

Note changes in alertness and activity level, and when they started
Record each vomiting episode, its timing, and the characteristics of the vomit
Take photos of stools or bring a fresh stool sample to the clinic
Weigh your pet at a consistent time and track trends in a log
Observe and record breathing rate and whether labored breathing occurs
Track daily food intake, loss of appetite, or changes in food preference

03How will the vet make a diagnosis? Common diagnostic tests

At the clinic, the vet will begin with a physical exam and then combine blood work, imaging, and specialist tests as needed to determine the underlying cause and severity.

Full physical exam

body condition score, abdominal assessment, and mucous membrane color

Blood count (CBC) with inflammatory markers

Biochemistry panel

blood protein levels, liver, kidney, and electrolyte status

Abdominal ultrasound

assess intestinal wall thickness, ascites, and organ changes

X-ray or advanced imaging (CT)

used for complex or challenging cases

04How is the condition treated and managed after diagnosis? Medications, diet, and care guide

Treatment depends on the underlying cause and severity. Regular follow-up visits are needed to monitor blood values and clinical signs, with ongoing adjustments to diet and medication management.

Medications and supportive care require regular re-evaluation at follow-up visits
Severe protein loss or anemia may require hospitalization and intensive support
Dietary adjustment focusing on highly digestible, hypoallergenic, or protein-managed formulas
After discharge, monitor appetite, body weight, and elimination patterns continuously
Schedule regular blood and biochemistry tests to assess recovery

05What should you prepare before the vet visit? Key information to help your vet diagnose quickly

Record when symptoms started, how they have progressed, and how often they occur

Bring a log of vomiting and diarrhea episodes from the past week

List all current medications and supplements your pet is taking

If available, bring a stool or vomit sample to the clinic

Bring previous test reports or imaging files if you have them

Consider calling ahead to book a clinic that can perform blood chemistry panels and ultrasound

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.