My mistake. Dog-accessible party preparations can include the following:
* destroyed pillows and cushions - Humans love hanging decorative items around their house for parties, a dog can do this by ripping open pillows or cushions and spreading the filling around the house, or even shredding articles of clothing or sheets, as long as the resulting decorations are spread around evenly and tastefully
* hidden presents - Humans often exchange gifts at parties, often favoring hand-made gifts wrapped in gift wrapping. to achieve a similar effect a dog might find a convenient container such as a shoe or slipper, and hide something they made themselves. some options might include barfing up breakfast, or pooping out last nights dinner. with their underdeveloped noses, humans are not able to appreciate scent marks, so it is not worth trying to gift urine
* snacks and appetizers - humans will often prepare large and varied spreads of snacks for their parties. while cake may be out of the picture for a dog, getting into a humans fridge or pantry and spreading the food around  the house will ensure that party guests can snack wherever they are. It is also a good idea to spread out your own food, preferably from the bag or container, as your human never puts out enough at a time to feed a whole party
* guests - all parties need guests. while the door may be difficult to open, most windows can be force open by jumping at them hard enough, make sure to invite all the fur friends in the area once you have opened your window
As long as your human does not see you preparing for the party, they will be very surprised when they come home to their surprise party

or 
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