Skip to Primary Content

SouthCare Animal Medical Center

Cancer in Pets – The Warning Signs

An old Golden Retriever is getting anesthesia before surgery.  One of the veterinarians is placing their hands over the dogs eyes on a medical table.


Benign tumors:

  • Not generally life-threatening

  • Slow growing

  • Do not spread to other parts of the body

  • Do not invade neighboring tissue

  • Cured by surgery if the entire tumor is able to be removed

Malignant tumors:

  • Generally always considered life-threatening

  • Damage healthy cells

  • Grow in an unrestricted way

  • Invade neighboring tissue

  • Spread to other parts of the body and establish growth in other areas after entering the lymphatic or circulatory system

  • Result of environmental factors or hereditary/genetic sources

  • Appropriate treatment dependent on the health of the animal and the size, location, and stage of the tumor


Veterinarians are able to detect a large number of cancers through a physical examination of the animal. Detection can occur through:

Visual identification:

  • Cancers that appear as growths or sores on or beneath the skin

Inspection and palpation:

  • Cancers under the skin

    Example: Testicular or mammary gland cancers

Hands-on examination:

  • Swelling or lameness may indicate a cancer of the bone

    Cancers that are found inside the body, such as in the spleen and liver, often show clinical signs before they are detected.

Common symptoms include:

  • Weight loss

  • Vomiting

  • Diarrhea

  • Constipation

  • Gastrointestinal bleeding


Companion animals are living longer today. Good food and living conditions plus increased and better opportunities for health care, are all indicative of our desire to have our pets live a good, long life. Since most cancers are discovered in middle-aged and senior dogs, clients need to remain vigilant with their veterinary visits if they want to detect a cancer in its earliest stage. One recommendation is that healthy animals seven years and older be given at least one yearly examination.

Pet parents need to know that the annual physical examinations provide baselines and screening information that could reveal the start of a change in the health of their pet. Early detection could improve the prognosis and prolong the animal’s life expectancy.

Yearly checkups may include:

  • Physical examination

  • Complete blood count

  • Blood chemistries

  • Urinalysis

  • Parasite check

  • Liver and kidney function tests

  • Thyroid levels

  • Chest x-ray

  • Electrocardiogram

  • Early renal disease health screen


During the time between the yearly examinations, it is a good idea for clients to be aware of the warning signs of cancer. Any of the following symptoms indicate a need to schedule an appointment with the veterinarian.

  • Lumps that do not go away, or ones that grow in size

  • Abnormal odors

  • Wounds that do not heal

  • Abnormal discharges, such as blood, pus, diarrhea, vomiting

  • Anemia

  • Bloating

  • Sudden weight loss

  • Change in appetite

  • Coughing

  • Breathing difficulties

  • Lethargy

  • Depression

  • Changes in urinary or bowel habits

  • Pain

  • Limping

  • Swelling

The warning signs do not always mean to expect a diagnosis of cancer; but if they do, clients who know to be watchful, observant, and to contact their veterinarian right away, may help to save their pet’s life.

If you’re concerned about the health of your pet, or it’s been a while since their last exam – CALL US to schedule an appointment.  SouthCare: (509) 448-4480  OR Click Here to Request an Exam