If your breeder is feeding her dogs raw, then he/she is the best person to ask if you are interested in keeping the pup on the same diet.
Commercial raw like Nature's Variety, Primal, Bravo, etc is pretty pricey, and all ground. For dental health you should also feed raw meaty bones in addition to just the ground.
I am a believer that raw is the best way to go, so if you want to do it, i say go for it. I did for a long time feed my dog a diet of morning kibble meal and dinner raw, and honestly it didn't do much for him, it wasn't until i switched to 100% raw and cut out all kibble that I saw huge improvements.
FOREVER in my heart:
CH Erin N Shamrock's S Hemisphere CD RN CGC
(1/3 UWP) U-CH Shamrock's Shippin Up To Boston RN CA NJ-N TT CGC "Shane" (4yrs)
"Ocean" Alabama craigslist dump (2yrs)