My 1-year-old dog has a nipple lump after first heat. Is it cancer?

Question

My 1 year old labrador has a lump under one of her nipples. Her 5th gland. I have checked her other nipples and there are no lumps under any of them. She finished her first season about two weeks ago. Is this cancer? Pet's info: Dog | Labrador Retriever | Female | unspayed | 11 months and 27 days old | 30 lbs

Christie Long, DVM · Accepted Answer

Mammary cancer is common in unspayed dogs, however usually not in dogs this young. She could be undergoing a false pregnancy, and that's what's causing the "lump", but I would definitely get this checked out. Your vet can easily rule out cancer with a test called a fine needle aspirate, and if she is having false pregnancy they usually go through it on their own in a couple of weeks. Spaying will prevent it in the future, and it will also mostly prevent the chance of mammary cancers.

My 1-year-old dog has a nipple lump after first heat. Is it cancer?

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