Interested in helping pet owners find the products they need to provide a happy and comfortable life for their beloved pets? Why not consider starting a pet supply business? This type of business has the potential to work well in both an online and offline capacity. If you own a pet sitting or walking business, why not add in a line of pet products? Or, if you want to start a virtual store front, why not focus on pets? You can sell everything from cat trees to crates for large dogs.