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Female dogs who are not spayed or who are spayed later than the first heat cycle are more likely to develop mammary tumors. Dogs have an overall reported incidence of mammary tumors of 3.4 percent. Dogs spayed before their first heat have 0.5 percent of this risk, and dogs spayed after just one heat cycle have 8 percent of this risk. [1]
The incidence of mammary tumours in un-spayed female dogs is 71% (of which approximately 50% will be malignant and 50% will be benign), but if a dog is spayed before its first heat cycle, the risk of developing a mammary tumour is reduced to 0.35%—a 99.5% reduction.
Pediatric spaying (also known as “prepuberal” or “early” spaying) or neutering is defined as performing an ovariohysterectomy (spaying) or orchidectomy (castration or neutering) on a kitten or puppy between the ages of 6 and 14 weeks. Spaying and neutering are
It is not essential for a female dog to either experience a heat cycle or have puppies before spaying, and likewise, a male dog does not need the experience of mating before neutering. Female cats and dogs are seven times more likely to develop mammary tumors if they are not spayed before their first heat cycle . [ 77 ]
Spaying and castrating can decrease the risk of hormone-driven diseases such as mammary cancer, as well as undesired hormone-driven behaviors. [48] However, certain medical problems are more likely after neutering, such as urinary incontinence in females [49] and prostate cancer in males. [50]
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Pyometra is a result of hormonal and structural changes in the uterus lining. This can happen at any age, regardless of how many heat cycles have occurred or previous pregnancies (or lack thereof), although it becomes more common as the dog gets older. The main risk period for a female is for eight weeks after her peak standing heat has ended. [2]