Hi,
If she is in her heat cycle then yes this is completly normal and will happen every six months or so. You will need to keep her away from all male dogs for at least 14-21 days to prevent unwanted pregnancy's.
If you think it is not time for her cycle keep in mind some females go into heat at different times and she may have started early or even have a second shorter heat. If this is not the case she may have a infection that needs to be addressed by her vet to determine if it is a bladder infection or a kidney infection or something else entirely.
Walter
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