Being a hero is like when you dive on a live grenade to save your chums in combat. That sort of thing. Adopting a dog is a nice thing to do, it doesn't make you a saint.
Bravery is not doing something that is easy, convenient, or beneficial to yourself, even if it may be somewhat difficult or society may oppose you.
And while it is nice that people are well-wishers, we should save the term "bravery" and "hero" for people who are really brave and do heroic things.