Hookworms, explained clearly — from first signs to full recovery.
Hookworms are blood-feeding intestinal parasites that affect dogs, cats, horses and livestock. Learn how to recognize them, how they spread, and the treatments that actually clear them.
Small parasites, serious consequences
Hookworms are slender nematodes, usually under 2 cm long, that live in the small intestine. They use hook-like mouthparts to latch onto the gut lining and feed on blood. A single adult worm can draw a surprising amount of blood each day, which is why heavy infections cause anemia — and why they can be life-threatening in puppies and kittens.
Different species affect different animals: Ancylostoma caninum in dogs, Ancylostoma tubaeforme in cats, and Bunostomum species in cattle, sheep and goats. They share the same broad strategy — attach, feed, and shed eggs that contaminate the environment for the next host.
The good news: hookworms are diagnosable with a simple fecal test and treatable with well-established dewormers. The key is catching them early and following through with the full course and a clean-up of the environment.
Hookworms across species
Each animal hosts its own hookworm species with slightly different behaviour. Pick yours for a focused guide.
Three things every owner should know
How animals get them
Larvae are picked up from contaminated soil — swallowed, absorbed through the skin of the paws or belly, or passed from a mother to her young through milk.
How to break the cycleWhat to watch for
Pale gums, weakness, weight loss and dark, tarry stool point to blood loss. In young animals, signs can escalate fast, so don't wait.
See all symptomsWhat clears them
Broad-spectrum dewormers such as fenbendazole and pyrantel kill adult worms. A repeat dose catches larvae that matured after the first round.
Compare treatmentsEstimate a dewormer dose
Choose a product and enter your animal's weight for a fast estimate. Always confirm with your vet and the product label.
Estimate a dewormer dose
Pick the product and enter your animal's weight for an at-a-glance estimate. This is a guide only — always follow your product's label and your veterinarian's direction.
Find the right dewormer for your animal
Primacur is a vet-grade fenbendazole broad-spectrum dewormer for dogs, cats, horses and livestock, available at HorsePreRace.