I've not experienced a split heat but from what I've heard it doesn't ususally happen over such a long period of time. That being said the female is fertile in the second half of the split heat. The theory is that in the wild canines split heat as a kind of notice that the bitch will be going into heat so that the males can come around and be ready. Just watch her, if she flags again and the male wants to mate than she's fertile.
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Tami |