The family of former US President Barack Obama have paid tribute to “our best friend”, after their beloved pet dog Bo died on Saturday. Bo, Michelle Obama wrote in a social media post, had been a “constant, comforting presence” since his arrival in the White House in 2009. The black and white Portuguese water dog was a gift for their daughters as they settled into their new home. “We had no idea how much he would mean to all of us,” Mrs Obama wrote. “He was exactly what we needed and more than we ever expected,” Barack Obama wrote in his own post, noting how Bo had been “happy to see us on our good days, our bad days, and every day in between”.(BBC)…[+]