its called bonding with the pup ..i agree ....i have mine in the house usually till about 5 months old ...then slowly introduce them outside...this pup ive got not didnt go outside till about a month ago hes now 8 months ,,,reason is he was a wild thing and needed a bit more time spent with him......i do think a dog is better outside ..but i dont think it affects there working abillty either way,,,,,i thinks it a bit more healthy for them outside not breathing gas fire fumes in ect ect and i think they keep a better coat if there outside....i try and spend as much time as possible with a pup i