Why is my puppy pooping milky substance with blood after deworming?
Poor Luna! I can definitely understand being worried - it's always scary to see blood or other abnormalities in your dog's stool. The good news is, if she is eating and drinking normally, active, and not vomiting, it's extremely unlikely that she would have parvo or any other serious illness - puppies with parvo are usually very lethargic, not eating, and vomiting frequently. So it doesn't sound like this is likely to be an issue with Luna :)
There are lots of things that could cause a milky substance like this with some traces of blood. Colitis, or irritation in the large intestine, can sometimes cause mucus with streaks or flecks of blood to be seen in the stool. This could also occur due to eating something she shouldn't have, or with a minor intestinal infection of some kind. She could also potentially have an infection in her anal glands, which are two scent glands located on either side of the rectum.
If she is acting normal apart from this, it's not likely to be an emergency - but if the problem continues, it would be best to call your regular vet or take Luna in for a recheck exam to make sure that everything is okay.
Updated on September 23rd, 2025