1 Records created or received by an individual, family or organisation (such as a government, cultural association, company or university) during its existence and selected to be kept permanently because they are considered to be of continuing value to society. 2  Unique and irreplaceable.
In domestic dogs, sexual maturity (puberty) occurs between the ages of 6 to 12 months for both males and females, although this can be delayed until up to two years of age for some large breeds. Pregnancy is possible as soon as the first estrus cycle, but breeding is not recommended prior to the second cycle.
Puberty in dogs can range anywhere from 6 months to 24 months depending upon the breed, with larger breed dogs maturing later than small breeds. Significant behavioral problems, as well as accidental breedings, can be avoided if neutered between 6 and 12 months.