Here are some sites I've found that are fun.
www.fetchndigs.com www.theritzyrover.com www.trixieandpeanut.com www.puppiesandbabies.com www.doggiedesigner.com
Those are just a handful. A lot of these places are pretty pricey, but, so much fun to look at all the cute clothes. Some of the clothes are so cute, I think they're worth it. Check it out! ")