First, we believe that there are plenty of wonderful pet companions in shelters all over the world just waiting for loving humans to come get them.
Secondly, we believe that humans who adopt pets need to know what the responsibilities are. Adopting a pet is bringing an animal into your home and promising to love and care for it. This means just because the kitten or puppy grows up and isn't as cute as it once was, the animal is still part of your family. You wouldn't take one of your children to a shelter, why would you take a pet?
Pedigree has a number of great short videos like this one that in 30 seconds really expresses what it means for the animal who is adopted. Mom says that a human who loves their pet is even happier. I will have to take her word for that - along with my 4 kitty sibs and two dogs that live downstairs with her mom. We were all adopted from a shelter or people who could no longer care for us.