Why is my dog throwing up and pooping black? Is it serious?
Black stool could indicate blood in the stool. Vomiting, and black stool could be caused by parasites, change in diet, toxin ingestion, infectious viral diseases, blockage in the intestines caused by ingestion of a foreign body, or a mass/growth in the gastrointestinal tract. In the case of an unspayed female dog , pyometra (a potentially fatal infection of the uterus) is a possibility as well, and this is very concerning. Please have Cassie seen by a veterinarian as soon as possible, as vomiting and possible blood in the stool can lead to dehydration and anemia, and can be very dangerous if left untreated. I recommend taking in a fecal sample from Cassie to your vet as well, as that may aid them in making a diagnosis. Good luck, and I hope she feels better soon!
Updated on September 23rd, 2025