I got a little bit confused as to you accepting bitcoins and altcoins as form of payment in your shop, or starting your own bitcoin exchange, or just fusing them all in one? Either way, starting something such as a business or an exchange doesn't need the interest only but it needs passion and action. Most people have pets being groomed and well taken cared of rather than humans so it is actually a good idea. Maybe you can put up a sign outside/inside of your store saying that you accept bitcoin as payment or rather endorse yourself to your loyal customers. It would pay off hopefully and you can boost your store's ratings. Not only you take care of their pets, but you generate income in the form of cash and cryptocurrency as well.