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Mammary Gland (Breast) Tumors in Dogs

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The addition of chemotherapy, immunotherapy, and complete ovariohysterectomy does not improve cure rates, although chemotherapy may offer some relief in bitches with advanced cancers that cannot be surgically excised.

Prevention:Spaying a female before the first heat cycle reduces her risk of breast cancer to less than 1 percent. If she is spayed after one heat period, her risk is still only 8 percent. After two heat cycles, however, there is no reduction in risk.

It is important to examine the mammary glands of unspayed bitches every month, starting at 6 years of age or younger. If you feel a suspicious lump or swelling, take the dog to your veterinarian at once. Experience shows that many owners procrastinate for several months hoping that a lump will go away. Thus, the opportunity to cure many mammary cancers is lost.

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WebMD Veterinary Reference from "Dog Owner's Home Veterinary Handbook"

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