How to train big dogs<br>Start early. Although this may not always be an option, starting the dog training process when your dog is less than 1 year old is ideal, especially when it comes to large dogs. Plan to begin training your dog as soon as you bring it home, which may be as early as 8 weeks.
You have to wait for the dog to be away from the mother to start training. 
You should wait until the puppy is about 8 weeks old and it may be away from it's mother, but it also could still be with the mother. 
( z1 obligate :ARG2 ( z2 wait :ARG1 ( z3 you ) :ARG2 ( z4 train :ARG2 ( z5 dog ) ) :time ( z6 be-located-at :ARG1 z5 :ARG2 ( z7 away :op ( z8 person :ARG0-of ( z9 have-rel-role :ARG1 z5 :ARG2 ( z10 mother ) ) ) ) ) ) )