My new puppy has white string from his butt. Is it worms or medicine?

Your puppies have roundworms. This is quite normal for puppies this age and easily treated, You will need to get some puppy wormer from either your vet or a pet shop and treat them, preferably now and again in 2-3 weeks.

Heartworm preventative medications also kill intestinal worms such as hookworms and roundworms, so it's not uncommon to see a puppy pass some worms in the stool after getting a dose of heartworm prevention. As long as Ginger is acting normal, this shouldn't be cause for concern. She will likely finish passing the worm the next time she has a bowel movement. You can take her outside for a potty break to see if she needs to go, or gently wipe her rear end with a warm washcloth to see if the worm will come out easily.

How lovely of you to save Bruno! It could be that he ate something or he could have worms. Worms are very common in puppies, and given he was a stray, he would not have gotten deworming treatments. I would have him seen by a vet first thing in the morning. Bring along a sample of his feces for the vet to examined. He will need a thorough health check, blood work, urinalysis, vaccines, heartworm treatment, and flea treatment in addition to deworming. If you don't want to assume financial responsibility for Bruno, I would bring him into the SPCA. They can get him the medical treatment he needs and can find a home for him.

Congratulations on your new puppy! I would recommend that she sees veterinarian for a new puppy visit. She will have fecal testing and see if she needs a deworming medication in addition to the Interceptor. She will also be started on her initial vaccines. I suspect the Interceptor tablet you gave is working and killing the intestinal parasites. That is why you are seeing them come out in the stool. You will want to keep her on it each month for the heartworm prevention as well. I hope this information helps!

No, antibiotics will not kill the worms. It is likely Leia has roundworms, and that requires a deworming treatment. You can get a deworming treatment over the counter, and I'd recommend using Panacur.

It's hard to tell from the photo, but if they are round and "spaghetti-like", they are probably roundworms. Most over the counter dewormers can take care of roundworms, however your vet can also prescribe deworming medications, and you can bring in a sample of them to your vet if needed to be identified in person.

There are no worms in the medication. This could have been a cutting line or from the manufacturing process and I doubt you have to worry. There is a possibility that your dog may have regurgitated an intestinal worm and it just so happened to come up with the medication. Usually heartguard will kill intestinal worms as well so that is a possibility. Unless (I know it is gross) Giulio ate the regurgitated medicine again you will need to repeat the heartworm dose.