Question: when are shih tzus ready to breed?
Answer: Sexual Maturity. While a female Shih Tzu goes through estrous cycles, a male Shih Tzu is ready to mate any time after it reaches sexual maturity. A large dog breed can take as long as 18 months to reach sexual maturity; but a Shih Tzu reaches sexual maturity around 8 to 9 months of age.