TL;DR: Finding worms in your dog's vomit indicates an internal parasite infestation that requires a veterinary exam within 24 to 48 hours, unless your dog is also showing signs of severe illness like lethargy or an inability to keep water down.
What does it mean if I find worms in my dog's vomit?
- Finding worms is a clear sign of an internal parasite infestation, such as roundworms (which look like spaghetti) or tapeworms (which resemble small grains of rice).
- Worms typically appear in vomit when the parasite load in the intestines becomes significant enough that they are displaced or migrate into the stomach.
Is it an emergency if my dog vomits up worms?
- The urgency level is generally Medium; your dog should see a veterinarian within the next 24 to 48 hours.
- While rarely a sudden crisis, you should seek emergency care immediately if your dog is extremely lethargic or has a painful, distended abdomen.
- Contact an emergency veterinarian right away if your dog has persistent vomiting and cannot keep water down.
How does taking a photo of the parasites help with triage?
- Taking a clear photo of the vomit and the worms helps your veterinary team identify the specific parasite species quickly.
- Because different worms require different medications (anthelmintics), a photo ensures your dog gets the correct treatment right away.
- Providing a photo can help your dog start treatment faster by potentially avoiding the wait for additional diagnostic testing.
Clinical Context (Merck Veterinary Manual)
Vomiting in dogs can be caused by dietary indiscretion, endoparasitism (e.g., Physaloptera sp), bacterial or viral gastroenteritis, anxiety, or motion sickness. If worms are present in the vomitus, endoparasitism should be considered a likely cause. Examination of the vomitus and fecal samples is warranted to identify the specific parasite. Persistent vomiting, depression, abdominal discomfort, or fever necessitate reevaluation, including abdominal palpation and radiographs to rule out foreign bodies or intestinal obstruction. A complete blood count, serum biochemical profile, and urinalysis may be indicated, followed by specific clinicopathologic testing if the animal is systemically unwell or if abnormalities are noted on abdominal palpation.
Chapter: Gastroenterology, Toxicology, Infectious Disease
Source: The Merck Veterinary Manual, 11th Edition (Page 387)