You know your pet better than anyone. So when something seems off, whether it’s a new lump, unexplained weight loss, or a change in their usual behavior, it’s natural to wonder what it could mean.

While these changes don’t necessarily mean your pet has cancer, they shouldn’t be ignored. Knowing what to look for and when to seek veterinary care can help you get answers sooner Learn common signs of cancer in dogs and cats, when to call your vet, and how Pieper Veterinary can help with cancer care.

What Are the Common Signs of Cancer in Dogs?

Cancer can affect dogs of any breed or age. Symptoms can vary depending on the type of cancer and where it develops. Some signs are easy to spot, while others may be more subtle.

Here are some changes worth discussing with your veterinarian:

New lumps or bumps: A lump on your dog may be harmless, but any new or changing growth should be examined.

Unexplained weight loss: Weight loss should be checked, whether your dog is eating less, eating normally, or eating more than usual.

Swollen lymph nodes: Enlarged lymph nodes under the jaw, in front of the shoulders, or behind the knees can be associated with lymphoma and other conditions.

Changes in appetite or energy: Eating less, sleeping more, or losing interest in favorite activities can signal an underlying health concern.
Persistent limping or discomfort: Unexplained pain or difficulty moving may require further evaluation.

Changes in breathing, bathroom habits, or digestion: Persistent coughing, vomiting, diarrhea, or difficulty urinating should be discussed with your veterinarian.

Unexplained bleeding or discharge: Bleeding or discharge from the nose, mouth, or other body openings should be evaluated by a veterinarian.

These symptoms can have many causes beyond cancer. The important thing is recognizing when something has changed and getting it checked.

While not all cancers can be prevented, early evaluation of concerning signs may provide more treatment options and help support your pet’s quality of life.

Call or book a consultation with a member of our oncology team today to discuss any questions.

What Are the Common Signs of Cancer in Cats?

Cats are particularly good at hiding discomfort, which can make early signs of illness harder to recognize.

Common changes to watch for include:

- - - Unexplained weight loss
    - New lumps or swelling, especially around the mammary glands, should be evaluated promptly
    - Decreased appetite, difficulty eating, or difficulty chewing
    - Drooling, bad breath, or swelling around the mouth
    - Sores that don’t heal
    - Vomiting or diarrhea that persists or recurs
    - Changes in grooming, activity, or social behavior

Even small changes in your cat’s daily routine can be worth mentioning to your veterinarian.

I Found a Lump on My Dog or Cat. Should I Be Worried?

Finding a lump on your pet can be unsettling, but not every lump is cancerous.

Some growths are benign, meaning they aren’t cancer. Others may require additional testing or treatment. Unfortunately, it’s not possible to tell whether a lump is cancerous simply by looking at it or feeling it. If you notice a new lump or bump, especially one that is larger than 1 cm (about the size of an M&M candy) or has an unusual color or appearance, schedule an appointment with your veterinarian or book a consultation today to have it evaluated.

Your veterinarian may recommend collecting a small sample of cells with a needle, performing a biopsy, or conducting additional diagnostic tests.

The takeaway: Don’t assume a lump is harmless, even if your pet seems perfectly healthy. Have new or changing lumps evaluated.

My Dog Is Losing Weight. Could It Be Cancer?

Unexplained weight loss is one possible sign of cancer in dogs, but it’s also associated with many other medical conditions.

If your dog is losing weight, it is worth calling your veterinarian, whether they are eating less, eating normally, or eating more than usual. If you have also noticed changes in energy, digestion, or behavior, schedule an examination.

Your veterinarian can help determine what’s causing weight loss and whether additional testing is needed.

When Should My Pet See a Veterinary Oncologist?

If your pet has been diagnosed with cancer, your veterinarian suspects cancer, or testing has found an abnormal mass or other concerning results, a veterinary oncology consultation can help you understand what is happening and what options are available.

A veterinary oncologist focuses on diagnosing and managing cancer in animals. Depending on your pet’s condition, a consultation may include:

- - Reviewing your pet’s medical history and diagnostic results
  - Discussing the type and extent of cancer
  - Explaining available treatment options
  - Developing a care plan based on your pet’s needs and quality of life
  - Coordinating care with your primary veterinarian

Meet the oncology team at Pieper Veterinary

What Cancer Treatments Are Available for Dogs and Cats?

Cancer treatment isn’t one-size-fits-all. Recommendations depend on the type of cancer, how advanced it is, your pet’s overall health, and your family’s goals.

Depending on the diagnosis, your pet’s treatment plan may include one or more of the following:

- - Surgery
  - Chemotherapy
  - Radiation therapy
  - Targeted therapies
  - Immunotherapy
  - Electrochemotherapy
  - Clinical trial opportunities, when appropriate
  - Supportive or palliative care focused on comfort and quality of life

Not all therapies are available at every veterinary hospital, but your veterinary oncologist can discuss all appropriate treatment options and help develop a care plan tailored to your pet’s specific diagnosis and needs.

Some treatments aim to eliminate cancer, while others help manage the disease or relieve symptoms.

Your veterinary oncology team can walk you through the possibilities, explain what each approach involves, and help you make informed decisions about your pet’s care.

Veterinary Cancer Care in CT

If your dog or cat has received a cancer diagnosis, you don’t have to navigate the next steps alone.

Our veterinary oncology specialists at Pieper Veterinary Stratford and Pieper Memorial Veterinary Center can provide consultations and treatment for pets facing cancer. Whether you’re exploring a new diagnosis, considering additional treatment options, or seeking a second opinion, our team can help you understand your choices.

Our approach is centered on your pet’s individual needs, with thoughtful communication, personalized treatment planning, and collaboration with your primary care veterinarian.

Have questions about your pet’s cancer diagnosis or treatment options?

Schedule an oncology consultation with Pieper Veterinary in Middletown or Stratford, CT.

Pieper Memorial Veterinary Center
730 Randolph Road, Middletown, CT
860-347-8387

Pieper Veterinary Stratford
95 Armory Road, Stratford, CT
475-271-2287

Signs of Cancer in Dogs and Cats: What Pet Owners Should Know