Labs and other sporting dogs are prone to a disorder called "Cold Tail Syndrome". If you google it you will see some of the symptoms and such. It could be worth asking your vet about if it comes up again. My lab had it a few years ago and a short bout of anti-inflamatories from the vet had her fixed up in no time. Good luck with your pup. If it happens again, try taking a video or pictures so your vet has an idea what you're talking about in case it remedies itself again before you take him in.
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