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Why is my puppy pooping milky substance with blood after deworming?
Updated on September 23rd, 2025
Pet's info: Dog | Mixed Breed | Female | unspayed | 1 month and 20 days old | 7.83 lbs
My puppy got diarrhea, after she was dewormed and had her Tri heart plus. Her stool has gone back to normal. However after she uses the bathroom, a milky substance comes out with Specks of blood in it. Is that her body working the medication out of her system or should I be worried about parvo?
3 Answers
Most Helpful Answer
Answered By Jennifer Summerfield, DVM CPDT-KA
Veterinarian, Certified Dog Trainer
Published on March 19th, 2017
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.
3Pet Parents found this answer helpfulRelated Answers from Veterinarians
Answered By Lauren Jones VMD
Veterinarian
If Luna's stool has already returned to normal, I would not be worried about parvovirus. With parvo, dogs generally remain sick (vomiting, diarrhea, lethargy, inaplerance, etc.) for several days to a week, even with supportive care. Until Luna has been full vaccinated with her distemper/parvovirus series, keep her away from other dogs and restrict her to your backyard.
Since she developed diarrhea after deworming medications, she may have been expelling some parasites. Due to this, inform your vet that diarrhea occurred and ask about submitting a stool sample for further parasitic evaluation. Other causes of the diarrhea may have been sensitivity to the medications, diet changes, viruses, etc.
The substance that is excreted after a bowel movement may be her anal gland secretions. Anal glands are sacs that empty during a normal bowel movement to mark a dog's scent. There is a wide range of a normal appearance in this secretion, from a thick toothpaste-like milky white substance to reddish dark brown. If you have seen true blood in her stool, speak with her vet, as this could indicate irritation from parasites or in the lining of her colon, or anal gland impaction or infection.0Pet Parents found this answer helpful
Answered By Dr. Melanie, BVSc MS
Veterinarian
Published on August 22nd, 2019
Poor Luna. Typically when a dog has Parvo and recovers from it, they don't get it again. It's very rare for a dog to have it twice, but I am concerned you are seeing blood in her poop again. There may be another issue going on, and I think she should see a vet now. Best of luck.
1Pet Parents found this answer helpful