If the lumps in your dogs mammary glands are the result of a false pregnancy than they could be due to mastitis (infection of the mammary glands), or inflammation. If your dog is older, the lumps could be due to breast cancer and the false pregnancy is coincidental.
Please use warm compresses on the affected mammary glands 3-4 times per day, for several days. If there is no change, if the condition worsens, or, if your dog has any other symptoms of illness, please take her to a vet ASAP.
If it is an infection, she will need antibiotics, anti-inflammatories, and in some cases in-hospital treatment if the infection becomes systemic.
If there any possibility of cancer, your vet should perform a fine needle aspirate or biopsy for diagnosis.
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