Symptoms of Colon Cancer in a Dog

Tumors can grow in the glands and lymph nodes of a dog's colon, resulting in colon cancer. There are two main types of canine colon cancer. The first is adenocarcinoma, or cancer of the apocrine glands, and the second is lymphoma, which is cancer of the lymph nodes. Though colon cancer can be treated to help a dog live a more comfortable life, the disease is fatal. Early detection is the best way to help your dog receive successful treatment, so it's important to monitor any symptoms that appear. Take your dog to the vet if any of these symptoms recur or worsen.

  1. Constipation

    • Dogs with colon cancer may struggle with bowel movements, resulting in constipation. This can be one of the first symptoms of canine colon cancer. Unfortunately, it can also be a symptom of a simple upset stomach. If your dog has constipation, it may pass in a day or two. If it doesn't, it is a good idea to take your dog to a veterinarian to make sure it doesn't have colon cancer or another serious condition.

    Increased Thirst

    • Increased thirst is another symptom that can be a sign of multiple conditions, including colon cancer. If you notice your dog drinking or urinating more frequently than usual, you should take it to a veterinarian.

    Bloody Stool

    • A dog's bowel movements should never contain blood or mucous. This is often a sign of a serious condition, so if you notice blood in your dog's stool, you should take it to a vet. Because colon cancer affects the anal region, bloody bowel movements are one common symptom of the disease.

    Vomiting

    • Canine colon cancer also makes it difficult for a dog to process and digest food, resulting in vomiting and weight loss. Your dog's appetite may not change at all, but it may be unable to keep food down. If your dog experiences frequent vomiting that does not go away within a day or two, you should take it immediately to a vet.