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Cancer in Dogs

November 5 2025

Hearing that your dog may have cancer is one of the hardest moments a pet parent can face. It’s natural to feel overwhelmed and uncertain, but understanding the condition and the options available can help you take the next step with confidence and hope.

At Lenity Vet Specialists in San Mateo, CA, we see canine cancer cases quite regularly. We also see countless stories of resilience and healing. Most importantly, pets can benefit from comfort and quality time through early detection and expert care. Our team provides advanced diagnostics and compassionate treatment to help you and your dog through every stage of this journey.

How Common Is Cancer in Dogs?

Cancer is one of the leading causes of death in older dogs, but advances in veterinary medicine have dramatically improved outcomes. Studies show that roughly 1 in 4 dogs and 1 in 5 cats will develop cancer during their lifetime, and nearly half of dogs over the age of 10 will face some form of the disease. While that statistic may sound alarming, early detection and specialized treatment can make all the difference.

Certain breeds, such as Golden Retrievers, Boxers, and German Shepherds, have higher risks due to genetics. However, any dog — regardless of breed, age, or size — can develop cancer.

Common Types of Cancer in Dogs

Dogs can experience many of the same cancers humans do. The most common ones include:

  • Lymphoma: Affects the lymph nodes and immune system.
  • Mast cell tumors: Common skin cancers that can appear as lumps or bumps.
  • Osteosarcoma: A bone cancer often found in large-breed dogs.
  • Hemangiosarcoma: A fast-growing cancer of the blood vessels, often affecting the spleen or heart.
  • Melanoma: Appears as lumps, and often affects the mouth, toes, or eyes. It can be aggressive if not caught early.
  • Soft tissue sarcomas: Tumors that develop in connective tissues like muscles or fat.

Each type behaves differently, which is why accurate diagnosis and a tailored treatment plan are so important.

Early Signs of Cancer in Dogs

Detecting cancer early gives your dog the best possible chance for successful treatment. Contact your veterinarian or Lenity Vet Specialists if you notice any of these (or any other) warning signs:

  • Lumps or bumps that grow or change shape
  • Unexplained weight loss
  • Decreased appetite or energy
  • Persistent lameness or stiffness
  • Difficulty breathing, eating, or swallowing
  • Abnormal odors or bleeding
  • Non-healing sores or wounds

Not all lumps or symptoms mean cancer, but it’s always best to have them evaluated by a veterinary professional.

How Cancer Is Diagnosed

At Lenity Vet Specialists, our diagnostic process begins with a thorough physical examination and medical history review. 

From there, we may recommend advanced testing such as:

  • Blood tests to evaluate organ function and detect abnormalities
  • X-rays or ultrasound to visualize internal organs and possible tumors
  • Fine needle aspirates or biopsies to examine suspicious tissue
  • CT scans or MRI for detailed imaging and surgical planning

Our goal is to provide clarity quickly, so you can make informed decisions about your dog’s care.

Treatment Options at Lenity Vet Specialists

Every dog and every diagnosis is unique. That’s why our specialists develop personalized treatment plans designed to target cancer effectively while supporting comfort and quality of life.

Surgical Oncology

Surgery is often the first step in treating many forms of cancer. Our surgical oncology team performs advanced procedures, including soft tissue and orthopedic surgeries, to remove tumors with precision and care. Whenever possible, we use minimally invasive techniques to reduce pain and speed recovery.

Internal Medicine

For cancers that affect internal organs or require ongoing management, our internal medicine specialists provide advanced care that supports your dog’s overall health. This may include medical therapy, nutrition planning, and monitoring for complications.

Regenerative Medicine and Stem Cell Therapy

Lenity Vet Specialists also offers regenerative therapies such as stem cell treatments to support healing and tissue repair. These therapies can improve mobility, comfort, and recovery for dogs undergoing surgery or long-term treatment.

Pain Management

Comfort is central to every treatment plan we create. Our dedicated pain management team provides medication, laser therapy, and other integrative approaches to help dogs feel their best during treatment and recovery.

Supporting Your Dog at Home

Your dog’s emotional well-being is just as important as their physical recovery. At home, you can help by:

  • Maintaining a consistent routine and calm environment
  • Encouraging gentle activity when appropriate
  • Feeding a high-quality diet recommended by your veterinarian
  • Monitoring for changes in appetite, behavior, or comfort
  • Attending all follow-up appointments for ongoing care

Even small adjustments in daily care can make a big difference in your pet’s overall comfort and outlook.

The Role of Compassionate Care

At Lenity Vet Specialists, we know that treating cancer isn’t just about removing a tumor or prescribing medication — it’s about supporting your entire family. Our team is committed to clear communication, emotional support, and providing the highest level of specialty care available in San Mateo and the surrounding Bay Area.

Our hospital is equipped to handle complex cases and coordinate care with your primary veterinarian, ensuring your dog receives seamless, comprehensive treatment.

Want to learn more? The National Canine Foundation has a series of articles on canine cancer, which you can read here. PetMD also has a blog on cancer in dogs, which you can read here.

FAQs

Can dogs survive cancer?
Many dogs live long, happy lives after cancer treatment. Early detection, specialized care, and consistent follow-up greatly improve outcomes.

Is cancer in dogs painful?
Some types of cancer can cause discomfort, but pain management and palliative care can help your dog remain comfortable and active throughout treatment.

How long can a dog live with cancer?
Survival rates vary depending on the type and stage of cancer, but advances in veterinary oncology have significantly improved both lifespan and quality of life for many patients.

When should I see a specialist?
If your primary veterinarian suspects cancer or you’ve noticed concerning changes in your dog’s health, scheduling a consultation with a veterinary specialist is the best next step.

Hope, Healing, and Expert Care in San Mateo

Hearing that your dog may have cancer is never easy, but you don’t have to face it alone. The team at Lenity Vet Specialists in San Mateo, CA, offers advanced oncology, surgery, regenerative medicine, and pain management services to help your pet live their best life.

If you’re searching for a vet near me who understands the challenges of canine cancer and offers compassionate, expert care, contact Lenity Vet Specialists today. Together, we’ll help your dog find comfort, healing, and hope.Want to learn more about our services? Visit our main Service page here. Click here to read about our regenerative medicine and stem cell therapy offerings, or go here to read about our emergency services.

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