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of approaching sterility in older age is the commencement of irregular heat cycles. Also, as she gets older the bitch is more prone to female disorders due to hormonal dysfunction.
There is a common fallacy that if a bitch is bred at least once in her young life, she will be immune from such female disorders as infections and tumors in her old age. This is not true; it has been proved that dogs that are not bred are usually less likely to develop growths, cysts, and tumors than the brood bitch.