How soon should I bring my pet to the vet after noticing symptoms?

If your pet has persistent lethargy or weight loss, it is recommended to seek veterinary evaluation within a week. If there is difficulty breathing or fainting, seek emergency care immediately.

How often does my pet need follow-up check-ups after treatment begins?

During treatment, regular blood tests and clinic visits are usually required — initially every one to three weeks, then at longer intervals as the condition stabilises. Follow your vet's recommendations.

What is the prognosis for multiple myeloma in dogs and cats?

The prognosis varies depending on the stage of disease at diagnosis, severity, and response to treatment. Early detection and specialist care can help maintain quality of life for longer. Discuss your pet's individual prognosis with your vet.

How much do the tests and treatment for this disease usually cost?

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

Disease Guide

Multiple Myeloma in Dogs & Cats: Lethargy, Blood & Bone Marrow Tests Explained [2025]

Multiple myeloma is a malignant proliferation of plasma cells that can cause bone destruction and kidney dysfunction; chemotherapy can help control the disease.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: ACVIM, ISFM, National Taiwan University Veterinary Teaching Hospital

When to See a Vet

Seek emergency care immediately

•Sudden inability to stand or collapse with poor responsiveness
•Persistent severe breathing difficulty or labored breathing
•Profuse vomiting or bloody stools with markedly depressed mental state

Schedule a clinic visit soon (within 24–72 hours)

•Ongoing loss of appetite with progressive daily weight loss
•Significant decrease in activity level and reduced interaction with people
•Noticeably increased water intake and urination, or change in urination habits

01What symptoms indicate something is wrong?

Multiple myeloma in dogs and cats typically presents as non-specific systemic signs; in the early stages it is often mistaken for a general chronic illness or age-related changes.

Lethargy and noticeably reduced activity
Weakness and difficulty standing or walking
Persistent loss of appetite and weight loss
Increased thirst, more frequent urination, or changes in urination habits
Tendency to bleed or slow wound healing (skin or gums)

Seek emergency care immediately if you notice the following symptoms:

⚠️ Sudden extreme weakness or fainting
⚠️ Rapid breathing or obvious respiratory distress
⚠️ Heavy or unexplained bleeding

02How can you assess the situation at home? Key observations and criteria for seeking emergency care

Observing and recording key changes at home helps the veterinarian evaluate the condition more quickly and arrange the necessary tests.

Note when changes in energy and activity level began and how they have progressed
Weigh your pet daily and record the figures; watch for weight loss over a short period
Track daily water intake and any changes in urination frequency
Film any unusual movement, urination, or bleeding with your phone
Bring all records and any previous test reports to the appointment

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

The vet will focus on blood tests and imaging at the visit; if needed, a bone marrow sample will be taken for cytology to confirm the diagnosis and assess disease severity.

Full physical examination

assessing mentation, mucous membrane colour, and lymph node size

Blood tests

including complete blood count and biochemistry panel

Urinalysis

checking for proteinuria, haematuria, or other abnormal components

Imaging studies (X-ray, ultrasound, or CT)

evaluating bone lesions or organ changes

Bone marrow evaluation

sampling for cytology and any additional required testing

04How is multiple myeloma treated and managed after diagnosis? Medication, diet, and care guide

Treatment typically combines systemic medication with supportive care; long-term monitoring of blood work and imaging is needed to adjust the treatment plan over time.

Treatment may include chemotherapy drugs alongside fluid therapy and other supportive care
Some patients require short-term hospitalisation to monitor treatment response and manage complications
Regular follow-up appointments to track blood test results and imaging changes
Medication regimens and supportive care adjusted according to disease progression
Attention to diet and home nursing care, with compliance to the hospital's long-term monitoring schedule

05What should you prepare before the vet visit? Key information to help the vet identify the cause quickly

Write down when symptoms first appeared, how they have progressed, and your pet's recent weight figures

List all current medications, supplements, or nutraceuticals being used

Bring any previous blood, urine, or imaging reports if available

If possible, film your pet's movement, urination, or any bleeding episodes for the vet to review

Call ahead to confirm whether bone marrow sampling can be performed at that clinic

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.