She does not want to "sit" but she can and will put her tail under her OR she sort of hovers over the ground. She went on her normal walk this morning. She is keeping her tail mostly down - but will wag if excited.
Yes, it is possible for a dog to "sprain" it's tail, but it doesn't happen very often. A dog would have to be up in the air and land very awkwardly with the tail to the side for this happen...and, dogs are generally too agile for that to happen.
There are a lot of other reasons for a dog to show what you've described. There can be fractures of the tail vertebrae or bruising of the tail, which happen from the tail being stepped on, caught in a door, or being injured in a fight or hit by a car. Those are pretty painful and usually they won't wag their tail at all.
The dog could have inflamed, infected, or impacted anal glands and that could also cause what you're seeing.
If your dog is a long-haired dog, severe matting of the hair around the base of the tail or around the rectal area couls cause a reluctance to move the tail.
If she is feeling some pain/discomfort in her lumbar/sacral region, that could cause these signs.
If she shows more movement of her tail each day, you probably don't need to worry too much about it. However, if the reluctance to show normal tail movement continues, you should have here seen by a veterinarian.
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