Yes! Each Pet will get one Bookshelf by default, but you will be able to purchase additional Bookshelves through the Bookshelf Customisation feature or earn them for free by reading lots of books to your Pet (1 free Bookshelf for every 150 unique books read!). You can decorate all your Bookshelves individually. They all have the same default state, but editing and saving one will not affect the others.