The perianal region of the dog contains several glands, specifically apocrine sweat glands, which are normally responsible for emptying their secretions into the lumen of the anal sacs. Anal sac apocrine gland adenocarcinoma is locally invasive and typically affects one anal sac; however, bilateral tumors can occur. Figure 1: Apocrine gland adenocarcinoma of the left anal sac.
In general these cancers result from the breakdown of bodily processes and because of impaired immune systems. These days dogs systems are called upon to digest far too much processed food, since the advent of commercial dog feed in the 's. Also, their evolutionary eating pattern has been subverted by over feeding which does not allow for periods of fasting which enabled their metabolism to clear toxins from their systems.
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Dogs and cats can function normally without these scent glands. Cancer can develop in the anal sac glands in dogs, but rarely in cats. In most cases, this tumor affects only one anal sac, but occasionally both left and right sacs are affected.
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Anal sac squamous cell carcinoma SCC is a rare tumor in dogs. Only eight cases have been described in the literature, and previous reports of treatment only describe surgery or palliative treatment with non-steroidal anti-inflammatory drugs. We report a case of a year-old female neutered Labrador with locally advanced anal sac SCC.
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