* Estrus Cycle: Female dogs typically go into heat (estrus) every 6-8 months. However, there's a lot of variation between individual dogs. If a German Shepherd had a litter 6 months ago, she may be in heat again, but it's not guaranteed.
* Litter Size: German Shepherds typically have litters of 5-10 puppies. Having only one puppy is very unusual and could indicate underlying health issues.
* Potential Issues: A single puppy could be a sign of:
* Infertility Issues: The mother dog may have developed fertility problems.
* Problems with the Male Dog: The father could have low sperm count or other issues affecting fertility.
* Developmental Issues: It's possible the other fetuses didn't develop properly.
If your German Shepherd has had only one puppy after a previous litter, it's crucial to consult with a veterinarian. They can assess the mother's health, investigate potential causes for the small litter, and advise on the best course of action.