Spaying reduces your female pet’s risk of certain cancers, especially mammary (breast) cancer in females. Spaying female dogs before their second heat cycle reduces their risk of having mammary cancer in their lifetime to less than 1 percent. Once dogs have had two heat cycles, the risk of developing this type of cancer increases substantially. Remember the first heat cycle is often “silent,” so spaying by the age of 5 to 6 months is recommended. (Newer studies show similar benefits in female cats.)
For the full article, read 10 Essential Facts About Canine Cancer (Bay Woof)
Or, download a PDF of the article.