There are plenty of good causes for donating pet food. Petco has a donation bin from the Helen Woodward organization in which they collect donations of both dog and cat food for the pets of homebound elderly and disabled who are not able to leave their homes to buy food for their pets but rely on their pets as a source of companionship and happiness. In this way Helen Woodward makes it possible for these people to keep their pets, that helps the owners and it helps the animals too because they get to keep their homes as well. So less animals having to be relinquished to shelters because their owners are too elderly or sick to care for them. Instead they get help from caring volunteers. Sometimes I like to go into Petco and buy some Nutro cat and dog food and just drop it in the bin. And if I have any cat food that I decide not to feed my cats or if my cats decide they don't like it, I drop that in the bin as well.