There's a switch that goes off around late-20s/early-30s, where you suddenly stop caring about what people think. You don't feel the same need to justify yourself or explain your choices. I had my first real 'couldn't care less' experience this week and, friends, it was glorious.
Taking a pet to the pound should be the last resort. You took on the responsibility, do what's necessary for them to have a good life. They deserve that. You decide later you don't want that responsibility, don't be heartless & drop them off at the pound. Find them a good home!