Common Intestinal Parasites in Dogs
Two of the most common types of intestinal parasites in dogs are hookworms and roundworms. It’s important to know about the different types of parasites in order to protect your dog. Talk to your veterinarian about monthly protection, such as NexGard® PLUS (afoxolaner, moxidectin, and pyrantel chewable tablets).
Hookworms in Dogs
Hookworms are tiny parasites that inhabit your dog's digestive system and attach to the walls of the small intestine. By feeding on dog's blood, they can cause anemia and other health issues. Hookworms reproduce by releasing eggs into the environment with feces. These eggs mature to infective larvae, putting dogs at risk in contaminated environments.
How Did My Dog Get Hookworms?
Hookworm larvae can be transmitted through the skin or by ingesting larvae in contaminated soil or grass in your dog’s environment. NexGard PLUS chews are safe for puppies 8 weeks or older, weighing 4 pounds or more.
Signs of Hookworms in Dogs
Hookworm signs can include:
Bloody diarrhea
Weight loss
Dull coat
Anemia
Pale gums
Weakness
In severe cases, hookworm infections can be fatal, especially in young animals. If you have any concerns about your dog’s health, please contact your vet.
Roundworms in Dogs
Roundworms are the most common parasitic worms found in dogs. This parasite spreads easily, which means infection is very difficult to control. Adult roundworms live in the dog’s intestines and feed off partially digested food.2
How Did My Dog Get Roundworms?
Roundworms are extremely common in puppies. NexGard PLUS chews are safe for puppies 8 weeks or older, weighing 4 pounds or more. Both puppies and adult dogs may also contract roundworms by ingesting roundworm eggs from their environment, while grooming, or by eating infected small hosts such as rodents.2 Talk to your vet about protecting your dog with NexGard PLUS- safe for puppies starting at 8 weeks old and weighing 4 pounds or more.
Signs of Roundworms in Dogs
Pot-bellied appearance
Dull coat
Coughing
Stunted growth
Vomiting
Diarrhea
Roundworm eggs are very resilient and can survive in the environment for years and can be a source of constant reinfection.
Key Takeaways About Intestinal Parasites in Dogs
Hookworm infections can be transmitted by ingestion of larvae from contaminated environments.
Roundworms are the most common parasitic worms in puppies.
Always consult with your vet when it comes to your pet’s health.
Ask your vet about NexGard PLUS chews for treatment and control of hookworms and roundworms.
- Carithers D, Miro G. Pet Owner Educational Atlas: Parasites. Zaragoza, Spain, Grupo Asis. 2012.
- Ascarid for Dog. Companion Animal Parasite Council. Accessed April 21, 2025. https://capcvet.org/guidelines/asc
Important Safety Information
NexGard® PLUS (afoxolaner, moxidectin, and pyrantel chewable tablets) is safe for puppies at 8 weeks, weighing 4 pounds or more. The most frequently reported adverse reactions include diarrhea, vomiting, lethargy, and itching. Use with caution in dogs with a history of seizures or neurologic disorders. Dogs should be tested for existing heartworm infection prior to starting a preventive. For more information, click here for full prescribing information.
NexGard® COMBO (esafoxolaner, eprinomectin, and praziquantel topical solution) is for topical use only in cats. Safe for use in cats and kittens 8 weeks of age or older, weighing 1.8 pounds or more. Use with caution in cats with a history of seizures or neurologic disorders. The most frequently reported adverse reactions include vomiting, application site reactions, lethargy, and anorexia. If ingested, hypersalivation may occur. Avoid direct contact with application site until visibly dry. For more information, click here for full prescribing information.
NexGard® (afoxolaner) is for use in dogs only. Safe for use in puppies 8 weeks of age or older, weighing 4 pounds or more. The most frequently reported adverse reactions include vomiting, itching, lethargy, diarrhea, and lack of appetite. The safe use of NexGard in pregnant, breeding, or lactating dogs has not been evaluated. Use with caution in dogs with a history of seizures or neurologic disorders. For more information, click here for full prescribing information.