Missing Cocker Spaniel Dog

Our Cocker Spaniel (tri coloured - mostly black and white with brown speckles on his front legs and chest) has been missing since 3.30pm Friday 24th Feb 2012, he was at Lybster harbour with my partner and took off up Sweeney Hill and has not been seen since. He is a very loving family pet and for him not to return home is totally out of character, we are very worried as he has never been alone at night before and are very anxious for his safe return. If you could keep an eye out for him we would be very grateful.