Wisconsin ? A dog weighing more than 120 pounds survived being frozen to a sidewalk overnight, probably because he was insulated by layers of fat, authorities said.

The Sheboygan County Humane Society says the “morbidly obese” dog, an aging border collie mix named Jiffy, froze to the sidewalk when he was left out overnight Wednesday. Shelter manager Carey Payne says few dogs could survive the single-digit temperatures, and it was probably the fat that made the difference.

Jiffy’s 59-year-old owner was arrested Thursday morning on suspicion of animal neglect, Sheboygan Police Lt. Tim Eirich said. She told police she tried to get the dog inside but couldn’t, and instead checked on him every few hours.