See, conformation standards cover everything, from the head to the tippy toes.
Dobermans are supposed to have cat feet, according to the AKC standard, meaning "well arched, compact...turning neither in nor out." Why, what did you think it meant?
Elka's feet aren't perfect Doberman feet, but they are pretty good, in my fond and amateur opinion. She doesn't have hare or rabbit feet like some breeds, where the center toes are longer than the side, or splayed toes. Her nails could use some work, but then, so could mine.
So, what's the cat food advantage? Why is it the preferred foot for the Doberman? According to CanisMajor.com, the compact foot "require[s] less energy to lift, allowing the dog to conserve energy and increase his endurance in the field." That's as good a reason as any, I guess! It makes sense in the context of working and endurance, going along with the intent for the Doberman to be a medium sized breed as well. Other breeds with cat feet include Bull Terriers (whose heads I love, by the by) and Akitas.
Unlike some breeds, the Doberman (or at least not Elka) doesn't have a lot lot of hair growth between the toes. Hair like this was recently a problem for one of our friends! (Was it Bailey? I can't find the post, but I remember it. Geeze.)
I do confess, Doberman paws have rather spoiled me for others. I see some pictures of dogs (like Neapolitan Mastiffs) and their paws just look all wrong to me. Of course, to aficionados of other breeds, Doberman paws may look weird. A lot of it just has to do with what you're used to, and what the dog is bred for.