Stricken Piotr Wagner, 50, collapsed with agonising chest pains as he watched telly at the family home in Kazimierza Biskupiego.  But as Pearl - a two-year-old Jack Russell cross - turned a heart shaped patch on her flanks towards her master, he told doctors he felt the pain melt away.

A grateful Mr Wagner said: "I want everyone to know about my big-hearted dog."  Doctors say they are baffled by the apparent cure.  "He certainly had a heart attack but it seems to have suddenly stopped and he is now healthy and back to normal," said one.

Who says it's gone to my head?

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