Hi Nathan,
I really like the idea behind your shop, and if I had a dog I would certainly be tempted to buy treats there!
I think it might help to make the flavors more clear in the listings-buyers do a lot of "scanning" through shops/items, and if they usually buy chicken flavored treats at the store, they might look through your shop trying to find that item (I figure you have the dog treats at the front of the title to help with search, but it could be helpful to maybe add the flavor onto the picture? Like have the treats and then maybe a little text that says "Bacon Flavored!" or something). Also if you have an opportunity to market to dog owners in real life (ie at the dog park, striking up a conversation about the treats you're giving your dog) that could help to build a loyal customer base/help you with the "word of mouth" marketing.
Best of luck! (: