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

Question

Hello, we just adopted our pup 3 weeks ago and he is currently on antibiotics for heart worms. Not every time, but every other time it looks like there is a little white string hanging out of his butt.. Almost like a mucus, but I am unsure of what it could be or if its the antibiotics causing it. Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | neutered | 20 lbs

Dr. Melanie, BVSc MS · Accepted Answer

Congrats on your new puppy! I'm wondering if you mean a deworming treatment for intestinal worms. Heartworms aren't treated by antibiotics, it is treated by Immiticide, nor are they seen in the anus. Heartworms reside in the blood vessels around the heart and lungs. You may be seeing roundworms in Alvin's anus, which can happen when a dog is being treated for intestinal worms. He needs at least two deworming treatments given two weeks apart to kill all the worms. If you don't think it's intestinal worms, then I would have him seen by a vet to diagnose what this white string is so he can be treated.

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

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