It might be pin worms.
No.
Tape worms
Look for small "grains of rice" near the anus or in the stool(s) .
small white worms.
There are a number of different kinds of small white worms. Do you find them in blankets, and other fabric? If so, they are moth larvae. If you find them in rotting meat they are fly larvae.
Normally, primary care provider evaluate and treat worms.
Roundworm If it is your dog you need to treat it for worms.
Thread worms are small thin white thread like worms beetween 2 and 13 mm long. They infect human GUTS.
they could be round worms....your puppy would need to be dewormed
Yes. It is normal to find live worms in your dogs stool if you got medicine that was over the counter. You should IMMEDIATELY go and get PRESCRIBED medicine.
Most of the time, unless your dog has eaten a long white string, anything that comes out of the stool that looks like that is worms. They are long and flat and look like strings, but they are a parasite. It can become potentially dangerous to the animal, and I would suggest a trip to the vet. However, if that is not an option, dewormers are sold in Wal-mart and pet stores. You just follow the directions and mix it with their food. Good luck.
The best way is bring a stool sample to the Vet.