In our small town of upstae ny, animals are always welcome pets, we had several, horses, cows & dogs, well I was 17 at this time and my little sister was not yet 15,  my parents had friends that were moving out of state we had always enjoyed going over there to visit, they had a nice yard to run around in, well,  the ONLY draw back was there DOG SAM !!!  he was pretty old and mean...  He was also VERY LARGE !!!  he must have weighed about 125lbs !  we often made games up trying to stay AWAY from SAM!!!   My sister at 14 had just started her first cycle that year, a lttle late maybe I dont know, but none the less heres what came of it -  Sis & i were in there yard one day as dad & mom were inside visiting, we were playing ( keep away from SAM ) but sam was awake that day & wanted to play,  he tackled my little sister & wouldnt let her up !as I ran over to help he shoved his nose up her skirt and began sniffing & licking !!!  He groweled at me as I got closer but did back away ! sis was almost in shock over this!  She was TOTALLY SCARED of him anyway, now he just forced her down & licked at her tight virgin pussy made her REALLY SCARED OF HIM !!!   It must have been a day or 2 later that Dad said to us - Hey guess what guys?  you like playing with sam over at the Kaprals right?  well - He is coming here to live now !!  they are driving too there new home and cant take him !  I looked at my little sister & saw the fear in her eyes !! Great we managed to say, but we were both uneasy over it...  Sam showed up the next day & things were pretty calm, as he checked out his new surroundings,  however as sis & I were upstairs in my room, we saw him go into her room & sniff her laundry,  a pair of her pantys lay on top witch he took off , layed on the floor & began to lick at them... Sis was HORRIFIED !!!  WHATS HE DOING?  he just smells your , thing, you know!?   WHY?  Hes a dog! why would he care?  its just instincted dont worry sis...   WRONG !!!!    the very next day, as he felt comfy in his new home he went right after my sister !  he would not leave her out of his site !!!  He kept trying to sniff at her and by late afternoon SHE TOLD ME SHE WAS SCARED !!    In that home, Dad & mom had a bedroom downstairs, Sis's & mine were both upstairs  I could look acrossed the hall into her room  witch I did sometimes too get a look at her young firm body and jerk off later... Anyway,  on this second nite of SAM being there, sis sat in my room crying,  -  IM SCARED OF HIM she said....  its ok, IM right here acrossed the hall ok?  after awhile of her asking me to tell the folks to get rid of him, she FINALLY went to her room...   I fell to sleep thinking of this girl at school that I wanted MORE THAN ANYTHING to  have sex with !!!   The noise of SAMS chain coller woke me back up !  He's UPSTAIRS !!!!   I TOO was scared of him !!!  I sat up and saw him nose his way through my sisters door,  WOW!!!  SHE IS GUNNA SCREAM ANY MINUTE I THOUGHT !!!   but she didnt?  instead I heard her softly say - no....  please dont....  sam , no...  STOP!   no, sam dont..?   I HAD TOO SEE WHAT WAS GOING ON !!!  as I stepped through the hall I heard a muffeled cry - at the doorway I FROZE IN MY TRACKS !!! SAM was on top of my little sister, his throbbing cock was stabbing back & forth inside her !!!  she cryed & pulled at the pillow wanting him to stop ! I knew there was nothing I could do now,  he wont stop till he's done !  I watched in horrer as he relentlisy fucked away at her virgin pussy...  Filling her deeper & Deeper !!!  It HAD TO HURT !!!  FInally he jerked & started twitching, ( he was coming ) !   my sister had stopped cying & was just in SHOCK as she felt him SPRAY over & over again DEEP IN HER PUSSY !!!    I ran right down & told Dad & Mom what had just happened,  mom took sis to the ER, and as for SAM,  Dad put him down for good !!!