To many brides, their pet is part of the family. One unique way to incorporate your furry friend into your big day is to feature them in a printed piece, like a guestbook. Here are some examples of couples who included their four-legged family members in their guestbook alternatives. Guestbook alternatives, like these posters, are a fun way to include pets in the wedding festivities since even though Spot might not be invited to the reception, guests will be reminded of their importance in your life when they sign the poster.