Tumors in the colon or rectum can cause constipation in dogs. Other causes of constipation in dogs include medications and a poor diet. A dog with chronic constipation should be checked for tumors.
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Symptoms
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Other symptoms of tumors besides constipation include passing blood with the stools, fur loss, loss of appetite and an increased thirst, according to veterinarian Dr. Kimberly Cronin.
Types
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Types of cancers a dog can have that causes constipation include lymposarcoma or cancer of liver, spleen or colon and adenosarcoma cancer of the anal sacs, located on either side of the dog's anus, according to Canine Cancer Awareness.
Misconception
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Dogs can grow non-cancerous grape-shaped polyps which can cause the same symptoms as for canine colorectal cancers. These polyps should be removed because they can break open and introduce harmful bacteria to the dog, according to "Dog Owner's Home Veterinary Handbook."
Diagnosis
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Dogs with suspected tumors get X-rays to determine where the tumor is and then get a biopsy in order to determine what type of tumor it is, according to Dr. Kimberly Cronin.
Treatment
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Any tumors are surgically removed. If the tumors are cancerous, then the dog receives chemotherapy and radiation, according to "Dog Owner's Home Veterinary Handbook."
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