I've heard of working like a dog, but this is ridiculous! Wendy the Whippet looks like the companion of comic book superhero (and even has the alliterative name to match!), but unless Superman made his landing on Victoria Island that doesn't seem to explain her origins. How can a dog be so unreasonably ripped? We have a few theories to start from.

Working Out?

No one has ever seen Wendy go to the gym; she seems to just have those massive muscles without working for them. We're jealous, too.

Gamma Radiation?

If the Hulk has taught me anything, it's that with great strength comes with great green fury when gamma radiation is involved. But by all counts, Wendy is actually quite nice and not at all green.

Extraterrestrial Super-Canine?

Well, there's no evidence that Wendy the Whippet has ever stopped a criminal or saved the world, and there are no super-powered aliens blowing through cities while fighting one another. That seems to rule out this possibility.

Genetic Mutation?

Bingo! Further research has shed light on the source of Wendy's amazing muscle mass: a unique genetic disorder that whippets sometimes experience at birth. Mutations of the Myostatin gene can have various results; a single mutation on the Myostatin gene will result in greater strength and racing performance. However, two mutations cause the breed to be double-muscled and to build muscle at a doubled rate. The result? Schwarzhound Schwarzenegger, absurdly buff dogs that can (probably) leap tall buildings in a single bound.

On the downside, she's not the most maneuverable dog. Most whippets are good racing dogs that can turn tight corners, but Wendy's sheer mass means she has to do a half-circle to turn around. If we can get her to join the X-Men, though, I'm sure that her unique strengths will still make her a valuable member of the team.