writers block hey (no i've never wrote a book) but i'm good at writing other stuff
if you write a blog for her then why not take some ideas from the blog? i take it the book will be fictional
you could maybe....
start from when she was a puppy
the adventures she's had finding out about the world
the places she's been to
highs and lows
people the dog may have met on her journey through life
the person in her life she likes the most
her favourite things
the things she doesnt like
her fear of getting caught by the dog warden (lol)
just jot a few things down and eventually they will all come together