I'm with Jean - I would find a different breeder if this one is so misinformed.
ALL my German Shepherds have been raised, from BIRTH, inside a house. I've raised 5 German Shepherds over the years and never had ANY feet deformations from them being raised inside the house.
Lauri & The Raw Fed Gang
Raw Dog Ranch
Winnie CGC - Corgi Mix
Chimanes Spice it Up Piquin (Kaynya) - Chinese Crested
Nator von Triton
HIC CGC (Mauser) - LC GSD
Piquins Some Like it Hot (Spike) – Chinese Crested
Piquins Too Hot To Handle - (Fuego) - Chinese Crested
Piquins Wasabi (Sabi) - Chinese Crested
Piquins Super Hot (Clark) - Chinese Crested
Banzai, Cloe, Mocha - Felines Extraordinaire
Neke, Tessa, Remi, Sadie, Riggs, Sasha, Tazer - DK, Mozart, Zoe - Gone but not forgotten