Dog experts disagree over why canines chase their tails in a race they can’t win. Some breeds – German shepherds, Finnish bull terriers, and miniature terriers – hit the spin cycle more than others, leading scientists to think tail-chasing is tied to genetics. But studies show puppies that aren’t properly socialized (for instance, they’re removed from their littermates too early) grow up to be habitual tail-chasers. Another cause could be a lack of vitamins in a dog’s diet. Some trainers suspect this hyperactive habit is a sign of a bored dog that wants to play; other trainers think tail-chasers are overstimulated by other dogs in the house or rowdy kids nearby. In any case, most dogs can be broken of the habit through patient training.
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