Sarplaninacs generally reach sexual maturity between the ages of 12 to 24 months, but it's important to note that individual dogs may vary. The exact timing of sexual maturity can be influenced by factors such as genetics, overall health, and individual development.

Sexual maturity in Sarplaninacs is marked by physical and behavioural changes. Male Sarplaninacs may exhibit behaviours such as marking territory, increased interest in females, and attempts to mount or mate.

Female Sarplaninacs may experience their first heat cycle, during which they become receptive to mating. It is crucial to be prepared and take appropriate measures to prevent unwanted breeding if you do not intend to breed your dog.

Consulting with a veterinarian or professional breeder is highly recommended for precise information regarding the sexual maturity of your specific Sarplaninac. They can provide guidance on recognizing the signs of sexual maturity, offer advice on responsible breeding practices if desired, and discuss the potential benefits of spaying or neutering your dog if not intended for breeding purposes.