No, you do not need to digitize anything, the disigns are already digitized. That just means that someone took a picture and turned it into an embroidery design for us. I have seen paw prints, there are ones with initials in the area above that says designs by cuties and I think there is a blank one but I am sure someone will find where you can download one from.
Welcome to cute, you will learn a lot, I know I have and am still learning!
Click on the Designs by Cuties at the upper right hand corner go to page 95 there is a applique emb pattern for a alpha paw print, you may can use by not stitching the letter. Good luck. There are probably more besides the alpha I just found this one.
You will not need to make any changes to the designs that you download from this site. Digitizing software like Embrid and Masterworks are good to have if you want to make major changes to a design or if you want to make a design from an idea or a picture (clipart). Just download Miss Veronika's designs and use them. Keep asking questions.