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Is she eating and drinking normally?
Is she eliminating normally?
Has there been any changes in diet, food, treats, etc?
Any changes in cleaning supplies, et?
What type of home do you have, such as apartment, single family, crawlspace, basement?
Do you live in the north or south part of the country?
I'd love to see the video. Can you upload it somewhere and give me the link?
Does she act teh same way no matter where you are with her?
I can think of a few things that might cause her to act in that manner. Often if there are mice in a house or crawl space you will have a dog sniffing the air a lot to try and locate where the smell is coming from. This might be happening in a home especially since it has been colder recently. Their sense of smell is much more sensitive than ours is so they tend to sniff more often when then come across an unusal odor.
Another cause might be something in the nasal cavity. Your vet would need to look in the nasal cavity and see if there is anything in there such as a grass seed. Some older dogs will have tooth issues that impact the nasal cavities. This can also cause sniffing which is not normal. Allergies might also affect her ability to smell and might trigger her to try to sniff more if she realizes her sense of smell is less than it was before.
It might also be a symptom of a focal seizure. Focal seizures can manifest as any repetitive behavior. Fly catching when no fly is there is a good example of seizure activity as is a dog that stares at a wall. You can read more on focal seizures here.
If she was my dog, I'd go ahead and have bloodwork run and imaging of her head to see if there is something in the nasal passage or some other issue like an abscess or tooth root or growth.
Take the video with you to the vet. I suspect imaging will likely give you a good idea of what the problem is.
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