I used to take My terrier x tilly to my friends house to play with her dog maddie. My friend is now pregnant and maddie went for tilly last time we went she will not tolerate ANY dogs around my friend, she's fine with other dogs when my friend's not there but when she is she's HUGELY protective. Maybe this is the case with ur girl? She will be able to sense all the extra hormones in your body, she will know you are expecting, and she may be protecting you and your baby. Just a thought.

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