[header] How to celebrate your cat's birthday [title] Think about whether your cat would enjoy a big party. [step] Is your cat very social? Does it tend to run to the door to greet guests? If so, your cat may enjoy having a lot of people around on its birthday. A more timid cat, however, may not enjoy a party. 
If your cat hides in the closet when friends are over, consider a party for just the two of you. [substeps] A more reserved cat may also like having just a few people over.