I just got a mini dauschound puppy about 5 days ago. He has been very lively, playing, and eating. But today he seems to not really want to eat much and he had diarreaha since yesterday and now he is throwing up. I noticed there is something that looks like a piece of string in his throw-up. I think it might be some kind of worm. I wanted to know if I could just buy him wormer at the vet's office but not have an appointment and also if this is serious. Cause I'm worried about Little Scooter.