I need a shih tzu expert how long do their periods last and wen can they have puppies?

I am very concerned because this is the first time I ever had a female shih tzu and I notice she has had her period and I want to no when does this period end and wen can she have puppies because I was told they cannot have puppies right away or their puppies would become unhealthy and die please help me thank you... show more I am very concerned because this is the first time I ever had a female shih tzu and I notice she has had her period and I want to no when does this period end and wen can she have puppies because I was told they cannot have puppies right away or their puppies would become unhealthy and die please help me thank you so much I really appreciate it.
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