Donut and coffee is a really good combo if you give it some thought. Coffee, depending on how it's made, can be bitter, while a donut is always sweet. When the two are combined, something really great happens in terms of flavor! Now, use that and incorporate a costume for your beloved pet. With so much fun and greatness being involved, it'll be hard to stay away from something so sweet. Don't be surprised if someone tries to take a bite or a sip, though!