Intestinal worms in dogs are a common concern for pet owners. These parasites can cause serious health issues if left untreated, including intestinal blockages and malnutrition. Understanding how dogs get worms, the signs to watch for, and the best treatment options will help you keep your dog happy and healthy.

Types of Intestinal Worms in Dogs

Dogs of any age, size, or breed can get worms. The effects of the worms vary based on your dog’s age, health status, and the number of worms in your dog’s system. Also, some of these worms can be transmitted to people.

There are several types of worms that infect dogs, including:

• Roundworms. Roundworms are the most common worms in dogs, especially puppies, and live freely within the intestinal tract. 
• Hookworms. Hookworms are a parasite that are about 1/2 inch to one inch long and attach to the lining of the small intestines feeding on blood. 
• Whipworms. Whipworms are 1/2-inch-long worms that live in the large intestines, creating inflammation and irritation. The eggs can live in the environment for years because they are resistant to drying and heat. 
• Tapeworms. An adult tapeworm can grow up to eleven inches in length. These worms are flat and segmented and look like grains of rice when they pass in the poop of an infected dog. Once dried, they break open and can release up to 20 fertilized eggs in the environment. 

Heartworms are also a worm, though not found in the intestinal tract. Adult heartworms live in the dog's heart and blood vessels. Heartworms are spread by mosquitoes. The good news? If your dog is already on heartworm disease prevention, it may include protection against certain intestinal worms.

How Do Dogs Get Intestinal Worms?

• Transmission from Mother to Puppy:
  Puppies are most vulnerable to roundworms and hookworms. Roundworms can be passed through the placenta before birth and through their mother’s milk after birth. Hookworm larvae may also be transmitted in milk. By just a few days old, puppies can have many worms in their intestines, which can cause serious problems like intestinal blockage if not treated early.
• Eating Contaminated Soil, Feces, or Prey:
  Adult dogs often get roundworms, whipworms, and hookworms by ingesting soil, infected prey (like mice or small mammals), or sniffing and eating contaminated poop. Whipworm eggs are commonly found in soil or items contaminated with dog feces. Hookworm larvae can also penetrate the skin during contact with contaminated dirt.
• Ingesting Intermediate Hosts:
  Tapeworms require dogs to eat an intermediate host, such as an infected flea or mouse. When a dog ingests the flea, the tapeworm eggs are released in the digestive system, hatch, and attach to the intestinal lining.
• Skin Penetration:
  Hookworm larvae can directly penetrate a dog’s skin, especially when the dog comes into contact with contaminated soil.

Signs of Worms in Dogs

Worms in dogs can cause a variety of signs, including:

• Gastrointestinal Problems:
  Vomiting, diarrhea, and excessive gas are common signs seen with roundworms, hookworms, and whipworms. Bloody diarrhea is especially linked to hookworms and whipworms, while roundworms may cause intestinal obstruction if the worm burden is high.
• Pot-Belly Appearance:
  Puppies with roundworms often have a swollen, pot-belly look due to the large number of worms in their intestines.
• Weight Loss and Malnourishment:
  Dogs infected with hookworms, whipworms, or tapeworms may lose weight. Hookworms and whipworms can cause malnourishment and dehydration, while tapeworms may lead to gradual weight loss with severe infestations.
• Pale Gums and Weakness:
  Hookworms cause blood loss, leading to pale gums, overall weakness, and failure to thrive, especially in puppies. Severe hookworm infections can be fatal for young dogs.
• Coughing:
  Roundworms and hookworms can cause coughing, especially if larvae migrate to the lungs.
• Skin Issues and Poor Coat Condition:
  Hookworm infections may result in skin problems and a dry, dull coat.
• Scooting, Licking, or Biting the Anal Area:
  Tapeworms often cause dogs to scoot, lick, or bite their anal area. Tapeworm segments may be visible in the poop or attached to the fur around the anus.
• Dehydration and General Debilitation:
  Whipworm infections can lead to chronic watery diarrhea, dehydration, and overall debilitation, most commonly in young or senior dogs.

Signs of Worms in Dogs by Type

Treatment for Worms in Dogs

Your veterinarian can recommend appropriate deworming schedules based on the age and need of your dog. Puppies may require more frequent deworming than older dogs. All dogs should be on monthly parasite protection beginning at 8 weeks of age.

How to Prevent Worms in Dogs

The best way to protect your dog is through prevention. To prevent worms in puppies and adult dogs, it’s important to:

• Provide proper environmental hygiene, such as cleaning up poop immediately.
• Properly deworm pregnant dogs.
• Deworm puppies.
• Provide year-round prevention, starting in puppies as young as eight weeks and at 2.8 lbs.
• Plan for several fecal examinations during your puppy’s first year.
• Regularly test adult dogs for worms at least yearly, but more often may be necessary based on lifestyle.

Worms in dogs are common, but with the right knowledge and care, you can protect your pet from these parasites. Watch for signs of infection, use preventive medications, and work with your veterinarian to keep your dog healthy. Staying proactive means your dog can enjoy a life free from worms and their complications.