New Hampshire and Maine this week are hosting two dog detectives specially trained to sniff out sewage leaks, bacteria and other contaminants in water. Logan and Sable were specially trained by Michigan-based Environmental Canine Services as rapid responders to storm water and pollution emergencies that could pose health risks. FB Environmental, based in Portland, Maine and Portsmouth, N.H., is hosting the dogs. There will be public demonstrations of the dogs’ tracking abilities Tuesday in Kittery, Maine and Wednesday in Portsmouth. The dogs identify human sources of bacteria, pinpointing contaminated areas so local officials can address the problem fast and minimize inconvenience. Their handlers say the dogs can investigate 50 or more storm water structures in six hours. Call 603-363-6311 for more information on the demonstrations.