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Ten Signs and Symptoms of Cancer in Dogs or Cats

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If your pet develops any of these signs of cancer, visit your veterinarian.

Photo of a dog with cancer  

Signs of Cat or Dog Cancer:

  1. Abnormal swelling, especially if it is firm
  2. Sores that don’t heal
  3. Weight loss
  4. Loss of appetite
  5. Oozing blood from the nose, mouth, or rectum
  6. Offensive odor
  7. Trouble eating
  8. No interest in play or exercise
  9. Difficulty passing urine or stool
  10. Unusual lameness or stiffness

You know your pet best, know how they are under daily circumstances. Some of these signs and symptoms are things only you will notice, or will see if something is askew. In general, if your pet is lethargic and not acting his or her normal self, then you should go see a veteranarian.


The articles here were answered by a variety of pharmacists and veterinarians
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  • After ten years of age, cancer kills 50% of dogs
  • In younger dogs, cancer kills about 33%
  • About 33% of cats die of cancer
    Recommended products for cat or dog cancer
    Foods without toxins
  • Taste Of The Wild Dry Dog Food
  • Supplement with Green-Tea and Omega 3
  • Be Well
  • Antioxidants and Vitamins
  • 1-800-PetMeds Super VitaChews
  • Evsco Antioxidant
  • Denosyl
  • Marin
    This information is for educational purposes only and is intended to be a supplement to, and not a substitute for, the expertise and professional judgment of your veterinarian. The information is NOT to be used for diagnosis or treatment of your pet. You should always consult your own veterinarian for specific advice concerning the treatment of your pet.

    The information about medications is not intended to cover all possible uses, directions, precautions, warnings, allergic reactions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for your pet. It is not a substitute for a veterinary exam, and it does not replace the need for services provided by your veterinarian.

    Note: Any trademarks are the property of their respective companies