I actually have one that I made - I'm really into scrapbooking. I have a book for Sandy and have one for my kitty Milo (he passed away). My Mom did this too, which is how I got started with it. She has about four scrapbooks just for the Yorkies we had while I was growing up.
Most scrapbooking stores/web pages have things for pets and you can make your own. It's really nice for me now that Milo is gone to be able to look back at all of the great memories we had with him.
Sandy's is getting filled up really quickly too!