Why Is My Dog Throwing Up Worms?

There’s nothing like waking up to a happy pup—unless they’ve had a rough night and left you a surprise. If your dog is vomiting worms, it’s alarming and, yes, a bit gross. But don’t panic—Bayside Animal Hospital is here to help you understand what’s going on and how to take action to protect your pet’s health.

Let’s explore what might be causing this unsettling symptom, how serious it is, and what you should do next.

What It Means When a Dog Throws Up Worms

Worms in vomit almost always indicate a parasitic infection, and while it’s not super common to see them this way, it does happen, especially with roundworms.

Roundworms are one of the most common intestinal parasites in dogs. In heavy infestations, they may migrate into the stomach and get expelled during vomiting. The worms themselves are often white or light tan, several inches long, and resemble spaghetti. If this sounds like what you’re seeing, roundworms are the likely culprit.

Other worms, like tapeworms and hookworms, don’t usually show up in vomit, but they can still cause digestive symptoms and serious health issues if left untreated.

Common Signs of a Worm Infestation

Seeing worms in vomit is a pretty dramatic sign, but often, other symptoms show up first. Keep an eye out for these red flags:

• Vomiting or diarrhea (sometimes with blood)
• Potbellied appearance, especially in puppies
• Weight loss despite a healthy appetite
• Scooting or excessive licking of the rear
• Worm segments in feces or around the anus (tapeworms often look like small rice grains)

If you’re noticing any combination of these symptoms—especially vomiting—you should contact your vet immediately. Early diagnosis makes treatment easier and more effective.

How Did My Dog Get Worms?

Even the cleanest, best-cared-for dogs can get worms. Parasites are sneaky and extremely common. Your dog may have been exposed through:

• Ingesting infected feces or contaminated soil at the park
• Fleas, which can carry tapeworm larvae
• Eating prey animals like rodents
• Transmission from mother to puppy, especially with roundworms and hookworms

Because the life cycle of parasites can vary, and some can even infect humans, prevention is key.

Treatment Options for Worms in Dogs

The good news? Most worm infestations are treatable, especially when caught early. Your veterinarian will likely recommend:

• Fecal testing to determine the type of worm
• Prescription deworming medications, which may need to be repeated
• Follow-up care to ensure all worms and eggs are eliminated

In some cases—especially if your dog has lost weight or is experiencing severe vomiting—supportive care like fluids and anti-nausea medication may be necessary.

And don’t forget about environmental cleanup. Picking up feces promptly, cleaning your pet’s bedding, and using flea prevention are all essential steps in stopping the worm life cycle.

Prevention Is the Best Medicine

To reduce the risk of future infestations, talk to your vet about a routine parasite prevention plan. Bayside Animal Hospital offers wellness exams where we can:

• Check for signs of worms and other issues
• Recommend the right parasite prevention products for your dog
• Discuss any changes in behavior, appetite, or energy that may signal a health concern

Monthly parasite prevention is a simple, effective way to protect your pup from worms and other parasites before symptoms ever appear.

Your Dog Deserves Relief—We’re Here To Help

Vomiting worms is never something to ignore. The veterinarians and staff at Bayside Animal Hospital are experienced in diagnosing and treating all types of parasite infections, including roundworms, tapeworms, and hookworms. If you’ve noticed vomiting or other signs of worms in your dog, call (916) 791‑8387 to schedule an exam. We’re here to help your pup feel better fast—and keep those pesky parasites at bay.