What are white long worms in dogs stool?

I can't answer your question because I have the same question you do, and I can't find an answer on the internet anywhere for it. My dog was about 2 months old when this also happened to him. (I got him from someone I found through the newspaper when he was 6 weeks old) The worm that came out of his mouth when he threw it up was at least 5 inches long-maybe longer, because the bottom of him was "coiled up" when my dog was done getting sick at the time. The worm was ALIVE and MOVING. It coiled on the bottom and its head was standing up and it seemed to me looking or at least rotating its head around. My dog had thrown up on a bean bag chair at the time and I freaked out so much when I saw the big worm (in comparison at the time to my shitz a poo's tiny body) that once I got a little bit out of shock I grabbed the bean bag chair and ran to the bath room and flushed the live GIANT worm down the toilet. I was so freaked out and couldn't stop crying. To this day I don't know what that worm was or what the cause of it was. My dog is now 5 years old.....and I am still worried sometimes to this day about that incident because I don't know what it was or what caused it. I know it had to be from the person I bought my dog from, but my dog is my life and my best friend and I still worry that something could be wrong somewhere that I don't know about. If you ever did find out what it was in your case I would greatly appreciate if you could e mail me or message me and let me know. staa10000@Yahoo.com

my name is Stacey and my best friends name is Tubby. Thanks.