Nobody plans for an overheating emergency. You're out on a hike, hanging at the lake, camping for the weekend, or just taking a neighborhood walk on a hotter-than-expected afternoon. Then your dog starts slowing down, panting harder than usual, and suddenly you're wondering if they're just tired... or if something's actually wrong. Here's what to watch for, what to do if it happens, and how to help keep your dog safe when the temperatures climb.