If you have a great animal shelter in your community, let them know you appreciate the work they do. If your shelter is not so great, maybe you can help to make it better, not just for the animals but for everyone.
Someone must have a special heart to work at an animal shelter. The work is hard, sometimes heart-breaking, but adoptions and reunions make it all worthwhile. So make some time to let a shelter worker know you appreciate all their efforts and their dedication for the pets and people of their community!