I got this idea from a lady who had a little boy in my Pre-K class about 2 years ago. He and his brother had birthdays in the same month, so she had a combined party for them. They both liked Scooby Doo, and this is what she came up with.
I think she had a Scooby Cake, decorations, etc. But she also got small inexpensive dishes that looked like "dog bowls" and wrote each child's name on it. She made cookies of all kinds and used dogbone shaped cookie cutters to shape them like dog biscuits. She put cookies in the bowls and gave each child a bowl full of "Scooby Snacks" to take home.
I thought it was a cute idea to go along with a Scooby, dalmation, or Blue's Clues theme.