Hi junecpg, and thanks for your post.
The symptoms you describe like many of those our pets show are difficult to allocate to any one thing without further investigation. It could be that your dog is just reaching her first cycle, that she is just mildly depressed due to some sort of change in her environment or life, or that she is indeed feeling unwell.
If you are still concerned I would recommend taking your dog in for a full consult with the vet, your vet should even be able to do a smear from inside your dogs reproductive tract and tell you whether her body is under going changes suggestive of coming into season.
I hope this helps. Let me know how you get on.
All the best,
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