✔ 最佳答案
Dogs need to have worm tablets now and again. Don't worry too much.
Your puppy must have eaten something outside and has been carrying worms inside him for a little while. Drontal plus has been working. That's why the parent worms have come out. The little ones that came out previously were off-springs of these bigger ones.
If the vet didn't say anything else it couldn't have been something serious like heart worm or other dangerous ones. It is not unusual for dogs to have worms and those that get to run freely outside should be dewormed regularly. Please calm down but keep watching.
I keep a journal of my observation as soon as I notice something strange with my dogs. It would be useful if you note down the date and time so that should you need to take him/her to the vet you can present facts clearly.