From the current looks of things that are selling it is the doggy outfits. Petco is reporting record sales in that department. If you are inventive you can do custom made outfits for dogs. They can be costume types or weather related to keep the dog comfortable. What Petco lacks is the ability to have every size for every dog in stock. Go to a local Petco and see what they are carrying and make the sizes they are having a shortage of. Sell them on eBay. If you have a quick enough turn around on making them then you will probably make a good profit this season.