I keep Callies in an accordion folder by year and I got one of these
Wag'N Pet Passport at the last pet expo and plan to start using it when Callie is due for shots in September to keep in her bag when we go places so if I need to I can show it to prove she has certain shots, it has a place for the vet to write the shot name and then sign it and stuff its pretty neat and it beats carrying the full size papers around when your needing to show the groomer or anyone she is up to date.