first off you are not crazy, secondly you can never start planning to far in advance. I was bummed out from the day I picked up Lola because her birthday is Dec. 26, which is the worse day IMO to have a birthday party. Then I was going to do it on her Gottcha Day and that fell on Easter
I had birthday parties for two of my dogs, I had napkins printed for my female saying Murphy's first birthday. We played kids games and I had prizes made, tee shirts and mugs that said Murphy's first we were there, in kid's crayon like print. You will have a blast not only having it but planning it. For some inspiration find the thread on the picture section from Lilo's mom, she just went to a birthday party that was over the top. Can't wait to hear more about your plans.