Oh parties! yay! we love parties!
Well annie loves her hide a bee and hide a turtle to no end... So I would definately say she gives

to that!
Maybe for party favors you put little doggie bones/biscuits and maybe those tinie tennis balls and put them in a doggie bag to give to your doggie guests?
lvmyyrki (or something like that) had gone to a yappy hour and they serve doggie daquiris there. She said the doggies loved those. Maybe you could make those. Here's the recipe she gave:
1 cup peanut butter
1 cup plain yogurt
1 tbls honey
1 cup water
2 cups ice
Blend well and freeze.
Makes approximately 10 - ½ cup servings for your dog and his/her friends
I bet having the party at your place would be just fine, and more easy!