banana boat rat

What is a banana boat rat? There is an urban legend (or not) going around about a family who took in a stray dog that ate their cat during the night! They take the dog to the vet to see what is wrong with the dog, and the vet explains that their dog is not a dog, it's in fact a banana boat rat. So what is a banana boat rat? Well we know one thing about them, they eat cats for dinner and can fool people into thinking they're dogs.