Sexual Maturity Veterinary & Aquatic Services Department, Drs. Foster & Smith, Inc. Q. At what age do dogs become sexually mature? A. Male puppies will display mounting behavior at a very young age (3-4 weeks), but are not producing sperm. This puppy mounting behavior will often disappear in a short time and then reappear as the dog approaches puberty. Half of male dogs will display mounting behavior by 5½ months of age, and will become able to sire a litter around that age. Note that some male dogs may be able to sire a litter before 5 months of age - 5 months is the average. Female dogs become sexually mature (have their first heat) between 5 and 12 months of age. Small breed dogs tend to have their first heat around 5-6 months, while some giant breed dogs will not start to cycle until they are 18-24 months of age. Although most dogs are sexually mature by one year of age, dogs should not be used for breeding until they are at least 2 years of age. 公犬有生育能力平均值是第五个月 母犬发情时间可能会从第五个月到第十二个月这段时间，有些小型犬会在第五个月和第六 个月中间发情，而有些巨型品种的母犬则较晚，甚至到第十八个月至两年才会发情。 繁殖年纪一般建议在两年後，观察公犬母犬性格，健康状况後，再考虑是否培育下一代。 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 219.86.66.52