Shih Tzus, like most dog breeds, typically go through a heat cycle, also known as estrus or the "heat period," which is a part of their reproductive cycle. The heat cycle in Shih Tzus typically lasts around 2 to 3 weeks, but it can vary from dog to dog.
The heat cycle consists of four main stages:
Proestrus: This is the initial stage of the heat cycle and can last around 7 to 10 days. During this stage, the female dog's vulva swells, and she may exhibit signs of attraction to males, although she is not yet ready to mate.
Estrus: This is the stage when the female is receptive to mating. It usually lasts for about 5 to 10 days. During this time, the vulva remains swollen, and a bloody discharge may be present. Female dogs are most fertile and will allow mating to occur during this phase.
Diestrus: This is the post-mating phase, which generally lasts around 60 to 90 days. If the female dog has conceived, she will proceed with pregnancy; otherwise, she will not display any further signs of being in heat.
Anestrus: This is the period of reproductive inactivity between heat cycles. It can last for several months and marks a resting phase before the next heat cycle begins.
It's important to note that during a female dog's heat cycle, it's crucial to prevent unwanted mating if you don't intend to breed her. Proper supervision and management, such as keeping her indoors and away from intact males, are essential during this time.
If you have specific concerns or questions about your Shih Tzu's heat cycle, it is recommended to consult with a veterinarian who can provide personalized advice and guidance based on your dog's individual circumstances.