12 Signs of Cancer In Dogs Owners Should Never Ignore

We humans are not the only species that must contend with the tragedy that is cancer. Even clams and other tiny aquatic life can get cancer. It is cancer in dogs and cats–our companion animals–that really hits home.

Cats develop cancer at a rate of about 1 in 5. In dogs, this rate is even higher. According to the National Canine Cancer Foundation, 1 in 3 dogs will get cancer at some point in life. Cancer is also the leading cause of death in dogs over age 10.

In this article, we are going to list 12 signs of cancer in dogs that we should never ignore. To cap things off, we’ll discuss a simple yet comprehensive exam that you can give your dog.

Let’s do this!

12 Signs of Cancer in Dogs

  1. Collapsing and fainting

If your dog seems to collapse or faint, you should contact a veterinarian immediately. Per the website Vetsnow, “Acute [serious] collapse in dogs is a sudden loss of strength, that causes them to fall and be unable to rise.”

Symptoms that may precede collapse include diarrhea, disorientation, staggering, vomiting, and weakness. There are two classifications of collapse or faint in dogs: hand limp collapse or complete collapse. The former entails the dog falling to the ground in a sitting position; the latter, a lying position.

The dog should be examined by a vet immediately.

  1. Fatigue and exhaustion

Fatigue and exhaustion are two common, similar symptoms associated with cancer cachexia. Cachexia is a metabolic condition and sign of potential cancer in dogs. Other potential co-symptoms of cachexia include impaired immune function, loss of appetite, and weight loss.

To rule out cachexia stemming from cancer, it is necessary to have the veterinarian conduct an examination. Once she has ruled out cancer, your vet may prescribe medication and suggest dietary changes.

Take your pet to the vet for an immediate examination.

  1. Incessant coughing

Dogs only rarely cough, so when they’re coughing regularly, there may be a cause for concern. Known causes of canine cough including:

– respiratory tract infection

– heartworm disease

– collapsing trachea

– laryngeal paralysis (partially-closed windpipe)

– “reverse sneeze” (caused by irritation of the nasal passages)

– chronic bronchitis

– cancer (typically of the heart, lungs, and respiratory tract)

The dog should be examined by a vet immediately.

  1. Diarrhea or other bathroom changes

Occasional diarrhea is probably not something to worry about. However, persistent and worsening diarrhea is a common symptom of cancer in dogs as well as other illnesses.

Other related symptoms that may signal health troubles include difficulty peeing or having a bowel movement, blood in the urine or stool, and vomiting.

If your dog has had abnormal peeing or bowel movements for some time, it is recommended to visit a vet immediately.

 

  1. Eye or nasal discharge

Excessive secretion of nasal discharge may be caused by a few things, including digestive tract disease and a swallowing disorder. Excessive secretion of eye discharge includes middle ear nerve damage.

Per PetMD, eye or nasal discharge is more likely to be a sign of cancer in middle-sized to large dogs with elongated noses.

As the causes of an eye or nasal discharge tend to be serious, a visit to the veterinarian should be in order.

  1. Mouth anomalies

Signs of possible oral cancer include swelling of the jawbone or gums. Bleeding, inflammation or darkening around orifices is also common. The swelling of the gums, tongue, or roof of the mouth is the most frequent symptom.

Other possible symptoms of oral cancer in dogs include bad breath, difficulty eating, drooling, facial swelling, lack of appetite, loss of teeth, panting, and swelling of the lymph nodes.

Your pet should be examined by a vet immediately.

  1. Nosebleeds

Nosebleeds in dogs can be a sign of a serious problem. The underlying cause is often epistaxis, a condition resulting from the body’s inability to clot blood. An infection may also be present.

In older dogs, nosebleeds are commonly a sign of cancer. Tumors will often grow gradually in the sinuses over a long period.

An immediate trip to the vet is needed to run necessary tests to pinpoint the cause of nasal bleeding.

 

  1. Pain or discomfort

Just as in humans, dogs with cancer may experience bodily (and emotional) pain. The pain most commonly associated with cancer is a general, achy feeling, especially in the area(s) where the tumor is present.

Specific types of cancer produce pain the certain areas. For example, bone cancer pain may be localized to certain bones of the body.

As canine pain can be both a cause of severe suffering and a sign of a potential disorder, a trip to the vet is highly recommended.

  1. Seizures

Seizures are caused by erratic electrical activity in the brain. In pets, as in human beings, tumor growth on the brain may be the catalyst. Injury to the head, such as blunt force trauma – may also trigger seizures in dogs. Other conditions that may trigger seizures in dogs include kidney failure, liver disease, and blood toxicity.

The most common cause of seizure in dogs, however, is idiopathic epilepsy, an inherited disorder for which the exact cause is unknown.

  1. Skin changes

Dogs also develop skin cancer, including malignant melanoma –common cancer found in humans. However, dogs often develop pigmented skin tumors, called melanocytosis, that are usually benign.

Other diseases may also cause skin changes. Your vet will order a laboratory examination to determine the exact cause. For this reason, the dog should be immediately seen by a vet.

  1. Weight loss

Cancer often alters canines metabolism, making your pet less likely to want to eat. However, decreased caloric intake isn’t the only cause. Cancer cachexia may also lead to accelerated fat loss despite taking adequate nutrients.

Gastrointestinal tumors are a type of cancer that may cause dogs to stop eating – and therefore lose weight.

To determine an exact cause, a veterinarian must administer a CT scan, CAT scan, or x-ray.

  1. Weight gain

On the opposite side of the weight spectrum, a sudden increase in weight is often a common sign of cancer in dogs. Weight gain with illness is particularly noticeable, as the dog will often eat less and still gain weight.

Again, a trip to the vet – and imaging tests – are needed to determine the root cause.

cancer in dogs

Final Thoughts: Check for Cancer in Your Dog

The Carlson College of Veterinary Medicine at Oregon State University lists 11 areas of a dog’s body to examine in their “check your dog” campaign.  Notice that the check, which dog owners may administer themselves, progresses from the tip of the nose to the tip of the tail for easy memorization.

The 11 areas to examine are:

1 – Nose/muzzle:

Examine the dog’s nose for debris, excessive drainage, or lesions. Also, note whether the nose is wet or dry. The ‘wetness’ of a dog’s nose will typically progress from moist to dry throughout the day. Check the symmetry of the nose and note any visible differences between sides.

2 – Eyes:

Check for any abnormal eye discharge, noting any increase or decrease in amount. Pet ‘weeping’ caries from one pet to another. Examine the symmetry between the eyes, including active movement, color, discharge, and shape. Look at all parts of the eye, including the whites. Note any color change, including any increased graying or redness.

3 – Mouth:

Check your pet’s mouth for any (abnormally) bad breath, lesions, and swelling. Healthy canine gums are pink, and their teeth should be free of plaque and tartar. Examine the symmetry of the nose and note any differences between sides.

4 – Jawline:

Outside of the mouth, the dog’s jawline should maintain a constant texture along the entire length of the jaw. There should be no sensitivity to touch along the jaw area, and it should be the same on both sides of the mouth.

5 – Ears:

Check the ears for any irregular debris, odor, or swelling.

6 – Skin:

Brush the dog’s hair back and check the coat and skin. Check for excessive bumps, lumps, and flakiness. Also note any changes to the skin’s color, including any dark or red spots. Pay careful attention to both sides of the spinal cord.

7  – Torso:

Examine the dog’s muscle tone and weight. If the dog is overweight, try to rectify the issue. As in humans, a disproportionate amount of fat held at the core increases the risk of health problems.

8 – Legs:

Check for areas of the legs that are sensitive to the touch. Next, check the legs for any skin abnormalities, including bumps, dryness, and swelling. Also, check the range of motion of the joints. All joints should be relatively flexible and free of discomfort.

9 – Feet:

Examine both the claws and pads of the feet. Between the toes, there should be no debris, and the area between one toe and the next should be symmetrical on all feet. Also, examine the nail bed for any discoloration or abnormal growth. Check the heat of the paws and note any abnormalities based on what is normal for your pet.

10 – Underbelly:

Thoroughly and gently examine the underbelly of the dog. Look out for any lumps and take note of any expressions of discomfort or pain. On the skin’s surface, check or any bumps, lumps, and sensitive areas.

11 – Anus:

Examine the anus and check for cleanliness, color consistency, and symmetry.

dog quote

Here are some final tips for checking for cancer in dogs:

– It is important to regularly check – around once a month – your dog’s skin to note what is normal for them. This way, you can more accurately track any changes and seek out additional help, if needed.

– Set a reminder to do a check once a month.

– Conduct the exam at a time when your dog is less prone to distraction.

– It may be a good idea to sketch out and copy a body chart. During the initial exam, provided that your dog is in good health, note the ‘normal’ conditions of each body part. In subsequent exams, refer to these notes for comparative purposes. This will give the vet a baseline should you even detect cancer in your dog.

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