My daughter wanted a dog birthday party for her 7th birthday.  I bought "The Dog" invitations, plates, napkins, balloons and placemats from Birthday Express.  When the girls arrived, they went to the Dog Pound. Dog cages were white metal cube shelves, which each held a small stuffed dog (I purchased several different looking ones from Target for $5 a piece) and a plastic dog bowl (less than $1, also from Target).  My daughter had made index cards for each dog stating each dog's fur color, "birthdate" and personality, such as "good with children" or "likes to dig." After each girl adopted her dog, she received an adoption certificate which I had prepared on the computer filled out with the dog's name (each girl named her own dog), owner name and adoption date. Each dog also came with a leash made from a grosgrain ribbon with a clasp sewn at one end and a loop sewn at the other end.  The girls then decorated their dog bowls with Sharpie markers.  They then got to make Shrinky Dink dog tags for their dogs, with Shrinky Dinks cut into the shape of dog tags and a hole punched in the top. They then made fancy collars for their dogs by stringing plastic jewel beads onto stretchy cord, with the Shrinky Dink dog tag in the middle. I tied each collar onto the dog so that the tag hung down in the middle, just like a real dog collar, and could easily slip on and off over the dog's head. The girls then clipped their leashes to the collars and could walk them (if the girls pull really hard on the collar, the string could break.  this happened to one guest so we just tied the leash around the dog's neck).  Then the girls and their dogs went on a dog bone scavenger hunt to find milkbones which I had hidden all over the backyard.  They got small pillows with a flannel dog print pillowcase (made by my aunt) as a prize.  We then had pizza, brownies cut into the shape of dogs with a cookie cutter, and ice cream, which I served in the dog bowls, which they loved! The girls then put on a dog show (they had practiced upstairs while we were waiting for the pizza). Each guest and dog was awarded a ribbon (made from construction paper) for different categories such as "Best Trick," "Best Personality," "Most Obedient," etc.  Since it was a sleepover, the girls changed into their PJs and then watched a dog movie before going to sleep. The next morning, we had breakfast and they played with their dogs until it was time to go home. We also played "Doggie Doggie where's your bone," with all guests sitting in a circle with "it" in the middle.  While "it's" eyes were closed, we hid a bone under someone's dog bowl.  "It" then had to guess who had the dog bone.  Once they guessed, the person who had the bone became it and the person who had guessed got to hide the bone. My daughter sent dog thank you cards with a picture of all the girls holding their dogs. My daughter and her friends LOVED this party!