Did you know that a dog's wagging tail doesn't always mean "I'm happy" or "I'm friendly". A wagging tail can also mean, "I'm the dominate dog and if you don't submit to me, I might have to bite you". Usually, a dominate tail wag is high and stiff.
Also watch out for tails that stand straight up. If two dogs meet and both their tails are high and tight, watch out! A fight might just be imminent.
