Unsinkable Jack Russells

A Jack Russell terrier named "Jagermeister" fell overboard in the Gulf of Mexico with nothing but a life jacket on. The good news: he treaded water for three hours and was eventually rescued by  boaters who saw the dog drifting in his orange life vest. To actually see the dog, they had to pass withing ten feet of the swimming canine. After pulling the dog on board, the saviors radioed the Coast Guard which informed them that someone had reported a dog lost overboard, and a reunion was facilitated.

Not to be outdone, another Jack Russell,  named "Russell," survived an accidental swim through the Thames Barrier after jumping into the river in pursuit of a fox. The Thames Barrier, located downstream from London, is a massive structure designed to prevent Greater London from being flooded by high tides and storm surges moving up from the North Sea.