Katherine McNamara and Her Puppy Are Barking Out Against Secondhand Smoke

Onscreen, as the star of Freeform's Shadowhunters, Katherine McNamara is a part-human, part-angel demon hunter. Offscreen, the 22-year-old is a typical dog mom, often flooding her Instagram account with adorable photos of her beloved puppy, Sophie.

Katherine, the ever-doting dog parent and animal-lover, knows that pets are twice as likely to get cancer if their owners smoke. Paw-ful! She and Sophie are spreading the word about how smoking affects pet health by serving as the faces of DoSomething.org's Four-Legged Finishers campaign. Powered by truth, the campaign activates young people to take a pic of their furry friend with a caption about how cigarette smoke is harmful to pets. You can vote on the top-12 crowdsourced memes and crown the Four-Legged Finisher of the year!