A-HA!! What you are describing in your Lab sounds like a textbook description of a condition called "cold tail." This condition is also called Limber tail, dead tail, limp tail, swimmer’s tail and various other names. We tend to see it in hunting dogs like Labs and Beagles, often after swimming in cold water, or after having a bath especially if the water was cold.
The good news is that it usually resolves on its own, and can start to improve in 3 to 5 days. Often, it takes 2 weeks to completely resolve.
Here is more about it:
In terms of what you can do at home, you may be able to give some aspirin (as long as she has no history of kidney problems, stomach problems and is not on other medications).
Please use Buffered Aspirin if you have it, and give it with a piece of bread or something low-fat to eat, not on an empty stomach. Avoid the enteric coated aspirin as it often goes through dogs undigested. Also, if your dogs start vomiting or have diarrhea, then discontinue the aspirin. Use it for 3 days AT MOST!
Here are links that tell you about it, with precautions and dose (5 to 10 mg/ lb, twice daily):
If your Lab is not 100% in 2weeks, or seem to be getting worse, and are not improved at all with the aspirin, then do go back to see your vet to make sure there is not some other process going on.
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I can tell you a bit more about anal sac issues. Not all dogs "scoot" their anal area when this happens.
The anal sacs (or anal glands) are little glands located at the 4 o'clock and 8 o'clock position if you are standing behind your dog. They are normally about the size of a chickpea. They have a little tube leading from the anal sac to the anal opening, and what Mother Nature intended was that every time your dog defecates, a few drops of the fluid contained in these sacs gets deposited on the feces.
Sometimes, however, the little tube gets blocked and the anal sac cannot empty. Anal sac fluid is continuously produced by the body so the sac gets more and more full. Eventually it can rupture out through the skin.
Here are some links to further information:
I do hope that helps you to help your dog!
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The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would strongly advise contacting your regular veterinarian.