Is your dog just chasing its tail – or is it obsessive?

Lots of dogs chase their tails – but for some the behaviour is a sign of the canine version of OCD. Now scientists are finding the minds of dogs and humans might be more closely linked than we thoughtCuriously, and perhaps eagerly, I am looking at a bull terrier named Sputnik, searching for a resemblance. He’s a stocky three-year-old, mostly slate grey, with a white stripe on his head and a pink splotch on his elongated, bull-terrier nose. So far, our only similarity is we’re b