Dog Intestinal Parasites and Puppy Welfare

Intestinal parasites are extremely common in puppies and can cause serious welfare impacts including stunted development, severe diarrhea, anemia, and death in heavily infected animals.

Key Facts

Studies show up to 50% of puppies have intestinal parasites at birth or shortly after
Roundworms can transmit from mother to puppies before birth and through milk
Hookworms cause blood loss severe enough to cause fatal anemia in young puppies
Puppies should be dewormed starting at 2 weeks of age and every 2 weeks until 12 weeks
Many intestinal parasites are zoonotic and can infect children
Fecal testing before assuming a puppy is parasite-free is recommended

Welfare Considerations

Heavily parasitized puppies experience significant welfare harms including malnutrition as parasites compete for nutrients, the discomfort of severe diarrhea, the weakness of anemia from blood-sucking parasites, and in severe cases, intestinal obstruction or perforation. Young puppies lack mature immune systems to combat heavy infections effectively. Parasitic disease in early life can affect brain development and long-term health outcomes. Prompt and appropriate deworming protocols prevent this preventable suffering.

What You Can Do

Work with your vet to implement appropriate puppy deworming protocols
Have fecal testing done on newly adopted puppies regardless of stated health history
Pick up pet feces promptly to reduce environmental parasite contamination
Prevent puppies from eating soil or feces where parasites persist
Maintain regular adult heartworm prevention products that also protect against intestinal parasites