I'm not really sure what you mean when you say you "don't know how they play their role in the big picture", but the big picture is that they have passed along their genes (good and/or bad) to your puppy.
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APBT- Lily Dale
GSD- CA Speed Queen Leontine Von Washateria
Mutt- Ilka Of Pear Orchard Cemetery BN RE CA CGC
Requiescat In Pace ~Lucky Rat Dog CGC~ 2000-2014