So do sharks consider dog a culinary delicacy? The answer is a resounding no. Of the more than 350 known species of sharks, none prefer the piquant taste of your favorite pet. This isn't to say that if Rover went for a swim where some types of sharks hunted that he wouldn't be eaten. The sharks that would likely eat your pet -- the tiger, bull and great white sharks -- are also the top three sharks responsible for attacks on humans.
Perhaps the likeliest shark species to eat your dog is the tiger shark. This specimen is widely known as the "garbage can of the sea," as it bears little scrutiny toward what makes up its caloric intake [source: Sea World]. The stomach contents of captured tiger sharks have yielded such dietary array as other sharks, sea turtles, squid, birds, car license plates and shoes [source: National Geographic].
Bull sharks, which can grow to 11 feet (3.5 m) long and weigh as much as 500 pounds (226.8 kg), may have more opportunity to eat your pet. This species tends to spend most of its time hunting for food along coastlines, where a dog might be likely to fetch a stick thrown by its owner. Like tiger sharks, bull sharks are opportunistic: They will eat generally whatever they encounter. This includes animals like horses, hippopotami and -- yes -- dogs. The bull shark's deadly combination of serrated teeth and extremely poor vision makes it entirely possible your dog would go from beloved pet to dinner if it happened to be in the wrong place at the wrong time.
But what about great white sharks? Thanks to movies like "Jaws," this species has become among the scariest around in the minds of humans. In reality, the great white's threatening reputation is largely unearned. During the 427 years between 1580 and 2007, there were 64 recorded deaths from unprovoked great white shark attacks [source: University of Florida]. Conversely, an estimated 50 to 70 million sharks (of all species) are killed by humans each year [source: Questacon].
Data does show that great whites are responsible for the most shark attacks annually. One study of great whites reveals that these attacks are generally the result of mistaken identity. Attacks on humans or dogs come from the great white's method of hunting. Most predatory sharks, like the great white, prefer fatty prey. Great whites particularly favor seals, which have a high blubber content. While the blubber keeps seals warm even in the coldest water, it's a tasty temptation for a shark. Sharks will also go after whales, which also have large amounts of fatty tissue.
A shark will seize a potential food source with its strong jaws. As hard as a great white can bite, it can also be surprisingly gentle. It uses this gingerly touch to determine whether the object in question is food (like a seal) or something unappetizing (like your dog). If the great white deems the animal isn't fat enough to eat, it will let go. This is why most great white shark attacks don't result in death.
Of course, if your dog is grossly overweight, it could be confused for a seal. And that would likely not pan out well for your dog.
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