Ouuu I've got one that just recently became an issue. My best friends dog has recently become terrified of sewer grates, all types, all sizes. When walking down the road she will either try and jump into traffic from the side walk to avoid them or plant herself. Also shows multiple signs of stress such as deep panting, wrinkled skin along nose and under eyes. My friend has owned her for close to two years now but before that all we know is that she was malnurished and came off death row. She was initially very skittish of sudden hand movements around her head and shy with men so we suspect it was not a very good situation at her first home. None the less we have both racked our brains and can think of no experince that could have triggered her sudden reaction, she previously just ignored them.