mini schnauzer

Question
can a puppy become pregnant at 6 months?  she has nipples that just came out about a week ago is this normal or could she be pregnant?

Answer
More likely her body is responding to the hormones she is now producing as she goes through puberty.  I think there are cases where a dog that young has become pregnant, but it is rare.  The best thing for most pets is to be spayed by 6 months.  See http://www.avma.org/animal_health/brochures/spay_neuter/spay_neuter_brochure.asp