What are the early symptoms of nasal planum squamous cell carcinoma?

Common early signs include repeated sneezing, persistent nasal discharge from one or both nostrils (often blood-tinged), reduced sense of smell, and decreased energy or appetite. If these signs persist, prompt veterinary evaluation is recommended.

What tests does the vet typically perform to make a diagnosis?

Your vet will begin with a physical examination, then arrange X-rays or a CT scan to assess the extent of the lesion. Cytology or a tissue biopsy is used to confirm the diagnosis, and blood work may be added if needed.

What treatment options are available?

Treatment depends on the location and extent of the lesion and may include surgery or radiation therapy. Discuss the most suitable plan with a specialist.

What follow-up is needed after surgery or treatment?

Regular follow-up visits and imaging are needed as scheduled by your vet. At home, pay attention to nasal care, any medication side effects, and changes in body weight, and discuss a long-term monitoring plan with 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

Nasal Planum Squamous Cell Carcinoma in Dogs & Cats: Symptoms, Diagnosis & Care [2025]

A malignant nasal tumour — early-stage cases may be cured with surgery

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: AVMA, ACVIM, National Taiwan University Veterinary Hospital

When to See a Vet

Requires immediate veterinary care (emergency)

•Heavy nosebleed that cannot be stopped within a short time
•Obvious difficulty breathing with abnormally rapid breathing
•Sudden fainting or brief loss of consciousness and unresponsiveness

Recommend scheduling a clinic visit soon (within 24-72 hours)

•Persistent one-sided nasal discharge with blood that does not improve
•Frequent sneezing that affects daily activity
•Markedly reduced spirits and appetite or rapid weight loss

01What symptoms indicate something is wrong?

When something is wrong with the nasal cavity or nasal planum, dogs and cats commonly show external signs such as changes in nasal discharge, sneezing, and shifts in alertness or appetite — watch closely for signs that persist or worsen.

Repeated sneezing or a noticeably increased sneezing frequency
Persistent nasal discharge from one or both nostrils, sometimes with pus
Bloody or blood-streaked nasal discharge
Reduced sense of smell or decreased response to odours
Decreased appetite, markedly reduced activity, or unexplained weight loss

Seek emergency care immediately if you notice the following symptoms:

⚠️ Heavy nosebleed that cannot be stopped within a short period
⚠️ Obvious breathing difficulty or abnormally rapid breathing
⚠️ Sudden collapse or brief loss of consciousness with no response

02How to assess abnormal signs at home and decide when to seek emergency care

Observing and recording key changes at home helps your vet determine the right time to seek care and identify the most important areas to examine.

Record the frequency, timing, and context of sneezing every day
Observe and document the colour, volume, and presence of blood in nasal discharge
Note any changes in alertness, appetite, water intake, and bowel habits
Weigh your pet regularly and note any short-term gains or losses
Take close-up photos of the nose and record videos of sneezing or abnormal breathing for your vet

03How will the vet make a diagnosis? Common tests and examinations

At the clinic, your vet will combine a physical examination with imaging and pathology tests to assess the location and extent of the lesion as well as your pet's overall health.

Physical examination

assessment of nasal appearance, masses, and local tenderness

X-ray

initial evaluation of the nasal sinuses and skull structure

CT scan

detailed assessment of the nasal cavity and the extent of bone invasion

Cytology or tissue biopsy (histopathology) to confirm the pathological diagnosis

Blood work

evaluation of overall health and risk for anaesthesia or treatment

04How to treat and care for your pet after diagnosis: medications, diet, and home care guide

Treatment depends on the location and extent of the lesion; follow-up care and home management after both surgical and non-surgical treatment are equally important.

Attend scheduled follow-up appointments after surgery or radiation therapy as recommended by your vet
Administer medications as directed and report any side effects or unusual reactions
Undergo regular follow-up imaging (X-ray/CT) to monitor lesion changes and recurrence risk
Provide home care including nasal cleaning and a quiet, comfortable environment
Adjust diet as needed to maintain nutrition and monitor weight changes
Discuss a long-term monitoring plan and alternative treatment options with a specialist

05What to prepare before your vet visit: key information to help your vet identify the cause quickly

Note when symptoms were first noticed and how they have changed over time

Bring a log of daily sneezing frequency and nasal discharge observations

Bring records of recent changes in weight, appetite, and activity level

Prepare a full list of current medications, supplements, and known allergies

Bring close-up photos, videos, and any previous imaging or test reports if available

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.