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SESK: Stuff Everyone Should Know · sesk.info/dog-spay-before-first-heat

When does spaying a female dog give the best protection against breast tumors?

Before her first heat.

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  1. After she turns ten
  2. Before her first heat ✔
  3. It makes no difference

Why: Spaying lowers the risk of breast tumors and prevents uterine infections. The ASPCA says doing it before a dog's first heat gives the best protection.

Huh, didn't know that: In dogs, about half of breast tumors are malignant, meaning cancer.

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References

Answer: Before her first heat. Spaying lowers the risk of breast tumors and prevents uterine infections. The ASPCA says doing it before a dog's first heat gives the best protection.

  1. ASPCA, Spay/Neuter Your Pet www.aspca.org/pet-care/general-pet-care/spayneuter-your-pet
    Spaying your pet before her first heat offers the best protection from these diseases.
    Checked 2026-10-11.

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