Veterinarians brought a young Labrador retriever named Grit back from the brink of freezing to death after she was trapped in icy water for what could have been several hours. Dr. Janice Bernhart, one of the veterinarians at Acton Animal Emergency Care Center who saved the 2-year-old dog, said Grit was near death and having seizures when she was brought to the center around 4:30 p.m. Tuesday. Grit’s owners said the dog had gone missing around noon. The owners said she had fallen through the ice into water that was shallow enough for her to stand in, but she was trapped there by the ice. Grit has made a full recovery, and the veterinarian expects the dog to have no lasting effects from the close call.