What to Do When Your Puppy Has Worms: Causes, Symptoms, and Treatment

Discovering that your puppy has worms can feel alarming, but you’re far from alone — intestinal parasites are one of the most common health issues affecting young dogs. The good news is that worms are very treatable, and with the right information, you can act quickly to get your puppy feeling healthy and happy again.

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Common Causes

Puppies are surprisingly vulnerable to intestinal worms, and there are several reasons why they’re so much more susceptible than adult dogs. Their immune systems are still developing, which makes it harder for their bodies to fight off parasites naturally. Understanding how your puppy may have picked up worms is an important first step in both treatment and prevention.

Some of the most common ways puppies contract worms include:

• Transmission from the mother. Many puppies are born with roundworms or hookworms passed to them either through the placenta before birth or through the mother’s milk during nursing. This is so common that most veterinarians recommend deworming puppies routinely, regardless of symptoms.
• Contact with contaminated soil or feces. Worm eggs can survive in soil and grass for months. When your puppy sniffs, digs, or mouths the ground — which puppies love to do — they can easily ingest these eggs without you even noticing.
• Ingesting infected animals or insects. Tapeworms, in particular, are often contracted when a puppy swallows an infected flea during grooming. Puppies can also pick up certain worms by eating infected rodents or birds.
• Contact with other infected dogs. Dog parks, kennels, and even casual contact with an infected dog’s stool can expose your puppy to a range of intestinal parasites.
• Environmental exposure. Whipworms and other parasites thrive in outdoor environments, and any puppy spending time outside is at some level of risk.

It’s worth knowing that maternal transmission is by far the most common route for very young puppies. Roundworm larvae can remain dormant in a mother dog’s tissues for years, reactivating during pregnancy and migrating into the developing puppies. This is why even a mother dog who tested negative for worms previously can still pass roundworms to her litter — and why vets deworm puppies on a standard schedule starting at two weeks of age, regardless of the mother’s history.

Age plays a significant role in parasite susceptibility. Puppies under six months are at the highest risk because their immune systems simply haven’t had time to build any meaningful resistance. As your puppy matures, their body becomes progressively better at limiting parasite burdens, though adult dogs are never completely immune. Seasonally, parasite transmission tends to peak in warmer, wetter months when larval survival in the environment is highest — though in mild climates, the risk is present year-round.

Diagnosis typically begins with a fecal flotation test, where a stool sample is mixed with a special solution that causes parasite eggs to float to the surface, where they can be identified under a microscope. Some parasites, like tapeworms, shed segments intermittently rather than continuously releasing eggs, which means a single fecal test can occasionally miss them. If your vet suspects tapeworms based on clinical signs, they may diagnose and treat based on your observations — such as seeing rice-like segments near your puppy’s rear — even without egg confirmation in the stool.

The most common types of worms seen in puppies are roundworms, hookworms, tapeworms, and whipworms. Each behaves a little differently in the body, which is why proper identification and treatment from a veterinarian is so important.

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Symptoms to Watch For

One of the tricky things about intestinal worms is that some puppies show obvious signs, while others appear perfectly fine despite carrying a significant parasite burden. This is why routine fecal testing at your puppy’s wellness visits is so valuable — it can catch a problem before it becomes serious.

That said, there are several symptoms that may indicate your puppy has worms:

• A pot-bellied or bloated appearance, which is especially common with roundworm infections in young puppies
• Visible worms or worm segments in the stool or around the anus — roundworms look like spaghetti, while tapeworm segments resemble small grains of rice
• Diarrhea or soft stools, sometimes with mucus or blood
• Vomiting, which may occasionally include visible worms
• Weight loss or failure to thrive, even when your puppy seems to have a good appetite
• Dull, coarse coat that lacks its normal healthy sheen
• Lethargy or low energy levels that seem unusual for a young, typically playful puppy
• Scooting or excessive licking of the rear end, which can indicate irritation caused by tapeworm segments
• Pale gums, which may signal anemia caused by hookworms feeding on blood

If your puppy is showing multiple symptoms from this list, or if any single symptom seems severe, it’s important to contact your veterinarian promptly. Worms can cause serious complications in young puppies if left untreated, particularly hookworms, which can lead to dangerous levels of blood loss.

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Symptom Severity at a Glance

Symptom	Risk Level	Action Required
Pot-bellied appearance, mild scooting	Mild	Monitor at home; schedule vet visit within a few days
Soft stools or mild diarrhea without blood	Mild	Call your vet within 24–48 hours
Visible worm segments in stool or around anus	Moderate	Schedule a vet appointment within 1–2 days
Vomiting, weight loss, or dull coat	Moderate	Call your vet within 24 hours
Diarrhea with blood or mucus	Serious	Call your vet today; same-day appointment needed
Pale or white gums	Serious	Seek emergency veterinary care immediately
Extreme lethargy, weakness, or collapse	Serious	Seek emergency veterinary care immediately

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Breeds Most at Risk

While intestinal worms can affect any puppy, certain breeds tend to face a higher risk or experience more severe consequences due to their specific traits and tendencies.

Greyhounds and Whippets are particularly vulnerable to the effects of hookworm infection. These lean, low-body-fat breeds have very little physiological reserve, meaning even a moderate hookworm burden can tip them into anemia more quickly than a stockier breed. There is also a well-documented strain of hookworm (Ancylostoma caninum) that has developed resistance to common dewormers and has been found at notably higher rates in racing Greyhound populations, making vigilant monitoring especially important for these dogs.

Labrador Retrievers and Golden Retrievers are at elevated risk simply due to their famously indiscriminate eating habits. These breeds are highly oral explorers — they mouth the ground, eat grass, scavenge on walks, and are far more likely than other breeds to ingest contaminated soil, feces, or infected prey animals. Their enthusiasm for the world around them translates directly into more frequent parasite exposure throughout their lives, starting in puppyhood.

Pit Bull Terriers and related bully breeds are another group worth mentioning, primarily due to population-level factors. These breeds are unfortunately overrepresented in shelter and rescue environments, where parasite transmission is higher due to close housing and variable deworming histories. A puppy adopted from a shelter or rescue situation — regardless of breed — should be assumed to need deworming and fecal testing right away.

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What You Can Do at Home

While you should always involve your veterinarian in diagnosing and treating worms, there are some helpful steps you can take at home in the meantime.

First, collect a fresh stool sample to bring to your vet appointment. Your veterinarian will use this for a fecal flotation test to identify which type of parasite is present. A fresh sample — ideally collected within a few hours of your appointment — gives the most accurate results.

Keep your puppy comfortable and well-hydrated, especially if they are experiencing vomiting or diarrhea. Offer fresh water frequently and monitor their food intake. If your puppy is not eating, is extremely lethargic, or has bloody stools, treat this as an urgent situation and seek veterinary care the same day.

Resist the temptation to purchase over-the-counter deworming products without guidance. Not all dewormers treat all types of worms, and using the wrong medication can delay proper treatment. Your vet will prescribe the most effective option once the specific parasite has been identified.

For prevention going forward, keep your yard clean by picking up feces regularly, avoid letting your puppy roam in areas where other dogs frequently eliminate, and stay current on flea prevention — since fleas are a direct route to tapeworm infection.

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When to See a Vet

You should schedule a veterinary appointment as soon as you suspect your puppy has worms. Even if your puppy seems relatively well, intestinal parasites in young dogs can progress quickly and cause lasting harm if not treated appropriately.

Seek same-day or emergency veterinary care if your puppy is showing any of the following:

• Bloody diarrhea or vomiting
• Extreme lethargy or weakness
• Pale or white gums
• Significant bloating with obvious discomfort
• Visible worms in large quantities

For routine concerns — such as noticing a few worm segments in your puppy’s stool or mild digestive upset — a standard appointment within one to two days is usually appropriate. Your veterinarian will conduct a physical exam, recommend a fecal test, and prescribe the correct dewormer based on what they find. Follow-up deworming is often necessary to eliminate any larvae that hatch after the initial treatment.

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How Pet Insurance Can Help

Vet visits, fecal testing, prescription dewormers, and follow-up appointments can add up quickly, especially when you’re already managing all the costs that come with a new puppy. Having a pet insurance plan in place from an early age means you’ll be financially prepared to handle these kinds of unexpected health issues without hesitation.

Protective Care: Get a free pet insurance quote and protect your dog today

For times when you need immediate guidance from a licensed veterinarian without leaving home, telehealth services can be a lifesaver.

For more clinical details on canine health, you can refer to the professional guidelines from the Merck Veterinary Manual.

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Worms are a very common part of puppyhood, and with prompt veterinary care, most puppies recover quickly and go on to thrive. By staying observant, keeping up with routine wellness visits, and acting swiftly when something seems off, you’re already doing everything right as a pet parent. Your puppy is lucky to have someone looking out for them.