For our dogs first birthday we got a cake from a doggy bakery and had a birthday party with just our family. They got a few new toys and treats. Any extra attention these dogs are in heaven (if that is possible)! The cake we got was adorable... it looked good enough for me to eat... my husband took a small taste and said I should pass
The dog is only going to remember spending time with you I wouldn't stress on making it a huge deal.
