How Do Puppies Get Worms?
QUICK ANSWER
Puppies most commonly get intestinal worms from their mother (through the placenta or nursing), from contaminated soil or feces, from eating infected prey, or from fleas (which transmit tapeworms). Puppies are especially vulnerable because their immune systems are still developing. Regular deworming and fecal exams are essential.
Worms in puppies are extremely common. Most puppies are actually born with worms or acquire them within their first weeks of life. Here's how that happens and what you can do about it.
Can puppies be born with worms?
Yes. Roundworm larvae (Toxocara canis) can be transmitted from mother to puppies across the placenta before birth. The larvae lie dormant in the mother's tissues and reactivate during pregnancy, migrating to the developing puppies. Hookworms can also be transmitted through the mother's milk during nursing. This means even puppies from well-cared-for mothers in clean environments can have worms from day one. According to the CDC, Toxocara roundworms are among the most common parasites in puppies worldwide.
How else do puppies get worms?
Contaminated soil is a major source. Worm eggs shed in the feces of infected animals can survive in soil for years. A puppy sniffing, licking, or eating contaminated dirt picks up the eggs easily. Puppies also get tapeworms by swallowing infected fleas during grooming. Hookworms can penetrate the skin through the paw pads when puppies walk on contaminated ground. Eating infected rodents, rabbits, or other small animals can transmit several types of worms as well.
What are the common types?
The most common intestinal worms in puppies are roundworms (most prevalent, the classic "spaghetti" worms), hookworms (feed on blood, can cause anemia), whipworms (live in the large intestine, cause bloody diarrhea), and tapeworms (flat, segmented, transmitted by fleas). Each type has a different transmission route and treatment protocol, which is why a fecal exam that identifies the specific parasite is important for targeted treatment.
How do I prevent and treat worms?
Most veterinarians recommend starting a deworming protocol at 2 weeks of age and repeating every 2 weeks until 8 weeks old, then monthly until 6 months old, and then regularly based on risk factors. A fecal exam at each wellness visit checks for parasites that deworming may have missed. Keeping your yard clean (prompt fecal pickup), staying on flea prevention (which prevents tapeworms), and preventing your puppy from eating wildlife or unknown substances all reduce exposure risk.
Worms are a normal part of puppyhood that every puppy owner deals with. They're common, they're treatable, and they're preventable with a solid deworming protocol and regular vet visits. Don't panic when you see them; just follow your vet's deworming schedule and keep up with fecal checks.
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