I found LabelCollector.com, which just so happens to have a canine named Cody supervising their shipping department. (Look over to the right of the "About" page. ) And Cody has a big job to do, for as of today's post LabelCollector offered 1307 labels in over 40 categories.
I went looking for "Cat" labels, but that got everything with the word "category," as often happenes. So let's see if I can post a link to the search for "dog" ... No, apparently not, but I promise you if you search likewise you will find many bright doggie images to enjoy. If you're a rabbit type you will enjoy the label above for Up 'n' Atom Carrots (search "Atom:").