Can a dog get diarrhea from getting its tail pulled?

Now this is the first time I have ever heard that a dog could get diarrhea from having its tail pulled.

I pull at my dog's tail, sometimes.

Before all the dog lovers and animal lovers out there get hysterically upset, can I just tell you that I pull it gently, only very occasionally and never to distress my dog. It's more play and affection, and my dog knows that and likes it. And she has never ever gone to defecate straight after I pull her tail.

So when my brother-in-law's wife saw this rare and unusual form of play the other day, she almost had a fit and practically shouted, "Don't do that! The dog will get diarrhea!"

Really???

I have done a cursory search on the net about this statement and also asked friends on FB to comment. All I have turned up is lots of people's comments that it is "mean", "dumb", "bad", "cruel" to pull a dog's tail but no definitive experience of a dog actually being triggered into having a bout of diarrhea.

On one of  Yahoo's pages, a reader responded to a similar question posted there like this "It makes me sick to even think about a dog getting it's tail pulled so much, that it would stress it out enough to cause it to get diarrhea."

This is a very emotional reaction (typical of people besotted with pets I am afraid), without calm thought. The person who had asked the question merely wanted to know if it was possible that a dog could get diarrhea from getting its tail pulled too much? Answer the question; and not frolic off on your own venting about how disgusted you are that a dog might be stressed enough to get diarrhea because it got its tail pulled.This kind of response contributes nothing to the knowledge-sharing purpose of a forum.

So is this a myth, an old wife's tale?

Found this video on youtube while searching for information on this topic.