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Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry for this concern for Ziva. While the estrus cycle can vary quite a bit in a female from as short as one week to as long as 4 weeks (or a little longer), the average time is going to be about 10-14 days.
So, while technically, her cycle isn't abnormal (at least not yet anyway), it's closely approaching what isn't typically seen especially in such a young dog.
If this were my female, I'd want to confirm that she's in estrus by examining cells from her vagina under a microscope. I might also consider an ultrasound if she appears to remain in heat for much longer. Cystic ovaries can sometimes be responsible for longer than expected estrus signs.
I'd also want to rule out any access to human hormones such as estrogen which might contribute to heat symptoms. If she comes in close contact or ingests these creams/ointments, they can cause symptoms consistent with a dog in heat.
I hope this helps. Deb