Top 10 Warning Signs of Cancer in Dogs and Cats

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May is Pet Cancer Awareness Month, a time to spread awareness of the symptoms of cancer in dogs and cats. As cancer is the leading cause of death in cats and dogs, knowing the symptoms your pets may present if they develop the disease can help you and your vet diagnose and treat your pet sooner. In order to help you protect your pet’s health, petMD.com has pulled together the top 10 warning signs of cancer in dogs and cats.

1. Lumps and Bumps: Not every lump or bump is necessarily cancerous, but consulting with your vet is the only way to be sure. If the lump is growing or not resolving itself, contact your vet and he or she will do a biopsy to determine the contents of the bump.

2. Abnormal Odors: Foul odors from any of your cat or dog’s orifices and/or body parts may be a cause for concern. Cancers of the mouth, nose, or anal regions can cause your pet to emit offensive odors.

3. Abnormal Discharges: Discharges such as blood, pus, vomit, diarrhea, and any other abnormal substance being excreted from your pet’s body should be checked out by a veterinarian immediately. A bloated or distended stomach could also be a sign of internal discharge.

4. NonHealing Wounds: Lacerations or sores that do not heal within a normal time range on the surface of your cat or dog’s body may indicate infection, skin disease, and possibly cancer.

5. Weight Loss: Sudden weight loss in cats and dogs not on a diet can be an indicator of many diseases and illnesses. If coupled with another warning sign of cancer, you should contact your vet right away and inform him or her about your pet’s symptoms.

6. Change in Appetite: While a lack of appetite in dogs and cats can be an indicator of many things, they never stop eating without a cause. Not necessarily a sign of cancer, a decrease in appetite can indicate an oral tumor, which would make it painful and difficult for your pet to eat and swallow.

7. Coughing or Difficulty Breathing: Although symptoms of heart and lung disease, coughing and abnormal breathing can also indicate cancer. This symptom will most likely occur if the cancer in your pet’s body has metastasized into his or her lungs.

8. Lethargy and Depression: If your pet has cancer, there is a chance that he or she will suffer from depression and sleep more, become less playful, and be less willing to go for walks. Although lethargy or depression in dogs and cats can set in with any illness, it is commonly seen in pets that have cancer.

9. Changes in Bathroom Habits: Any changes in your pet’s bathroom habits including difficulty using the bathroom, frequent bathroom use, and blood in urine or stools are potential warning signs that cancer has developed in your pet.

10. Evidence of Pain: Limping or other evidence of your dog or cat in pain when he or she is active, or if the pain is too great for them to be active, can be indications of cancer of the bone.

While no one sign purely indicates cancer, a cat or dog displaying two or more of these symptoms should be taken to the veterinarian for an exam so that he or she can be properly diagnosed and treated accordingly, because early detection can make all of the difference in the case of a positive diagnosis.

46 thoughts on “Top 10 Warning Signs of Cancer in Dogs and Cats”

  1. My dog is a blood donor and gets a complete blood, fecal and urine work up once a year for free
    Its a great little perk
    If you aren’t sure you can afford the tests on your own why not look into blood donation in your area?
    Donation is quick and not any harder on the dog than it is on you – my Ruby bounces back in a day or two and she gets to save lives!

    Reply
  2. Sadly not any of these were evident with my Sarge. He was diagnosed with epilepsy at age 1 1/2. We now assume that the seizures were caused by brain cancer. Sargie passed shortly after his 4th birthday. He went into a seizure and didn’t come out. He was full of life, ate like a fiend, playful, fun and a wonderful baby. He had no tumors or patches or odd colour skin. The only indication of something was the seizures. We did treat the seizures with medication and for a year and a half to two years he was seizure free. Cancer never even entered into our heads or the Vets.

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