wag toto1. A wagging tail always means a pup is happy. Many people think a wagging tail means a dog is happy, but that’s not always true. Messina says dogs wag their tails when theyThe Cairn Terrier was first publicly presented in 1909, but their real popularity came to fruition in the 1930s after a Cairn Terrier played Toto in The Wizard of Oz. It was in 1913 that