If, like most people, you often look at your Labradoodle, or your English Boodle, or your Giant Schnoodle (Seriously, Google "poodle mixes") and think, "Man, I really wish I knew what Sir Barksalot would look like as a jacked superhero of my choosing", well, you're in luck. Just send your dog or cat or albino crocodile's photo'd face to the good dudes behind Pets Are Superheroes along with, like, a million yen ($40), and in two weeks, you'll be rewarded with a drawing of your pet as a magnificent and powerful super-mutant. And if you're wondering which would match up with your pet, here's a damn helpful guide.
Large Dogs: Big canines require heroes with a little more bulk, so as to not create too extreme of a bobblehead effect. The Hulk (preferably the grey one as he had all the green hulk's strength but kept Bruce Banner's intelligence!) is an obvious choice, as is Thor, if you think your animal has the paw-dexterity to handle a giant magic hammer.
Small Dogs: Littler pups might benefit from a more agile, sleeker choice, like the Flash (if your dog is um, fast), or Iceman (if your dog is kind of cold). or Puck from Alpha Flight (if your dog looks like a mustached dwarf bouncer from Canada with extraordinary acrobatic abilities).
Cats: Because of their evasive behavior and suspicious view of the world, cats are best represented by vigilantes (The Punisher) and criminals bearing their same name but additional sexy outfits (The Black Cat).
Wolverines: Spiderman, obviously.
Birds: Though everyone is probably already creeped out by the fact that you keep birds, parrots would probably best be repped by someone sassy and back-talking and murderously dangerous like Deadpool, while parakeets and other small birds should all be pictured as Jubilee from X-Men, because, like her and her stupid firework powers, they suck.