People like to dress their dog up, but that's because it's a fun luxury. Buying optional clothes for your dog is your way to torture them without having to face any legal repercussions. Let's face it, very few dogs actually like wearing clothes. You can tell when they don't, yet we still love to put them in an Indiana Jones hat and jacket just so we can take a picture. Now imagine if dogs had to wear clothes and it was no longer an option. That would get annoying very quickly. Think about having to get your dog a complete wardrobe, keep it clean, and dress them everyday. I guess that's what having kids is like.
Once the pet stores started selling Star Wars pet costumes, it was all over for me. I spent one hundred dollars in ten minutes. I went crazy for those costumes.