What Happens if a Puppy or Kitten Isn't Wormed?

A puppy or kitten that isn't wormed rarely looks poorly at first, but the parasites are quietly taking what a growing body needs. Left alone, a heavy roundworm burden stunts growth, irritates the gut and in the worst cases can block it altogether. Giardia and hookworm adds diarrhoea and weight loss. Lungworm adds respiratory symptoms and can even lead to heart failure. Meanwhile, each infected stool seeds your garden with eggs that survive in the soil for years, so reinfection keeps happening, and some worms can pass to children too. The reassuring part is that most puppies and kittens bounce back quickly once the worms are dealt with, even if that happens later than it should.

The Vale Veterinary Group would much rather none of this ever gets going, which is why our RCVS-accredited practice offers free puppy and kitten checks before the vaccine course begins, and the first vaccination visit itself comes with worm advice and a complimentary spot-on treatment. Keeping treatment going once the excitement of those first few weeks settles is where a dose tends to slip, so our Premier Paws Club builds worming into one simple monthly plan. If your puppy or kitten has already gone without worming and is looking pot-bellied, slow to grow or passing worms, we can see them promptly, check a stool sample in-house and get the right treatment underway. A youngster who is weak, vomiting or has stopped eating should be seen the same day, so get in touch with us and we will fit you in at the closest of our centres in Cullompton, Tiverton, Honiton and Uffculme.

Why One Tablet Is Never the Whole Job

• One tablet is never the whole job: it kills the adults in the gut that morning while the next wave of larvae is still developing in tissue.
• Most infected puppies and kittens look perfectly well at first, so treating and testing on a schedule beats waiting for a sign that something is wrong.
• No single wormer covers every parasite, and a stool sample is what tells us whether we're dealing with worms, coccidia or Giardia.
• Roundworm and Giardia can pass to people, which makes daily poo picking and hand washing as much a part of the plan as the treatment itself.

How Do We Choose the Right Wormer?

We choose the right wormer at the appointment itself, after a hands-on examination and a trip to the scales. Every product is dosed by weight, and a puppy can outgrow their last dose inside a fortnight. We feel along the tummy, check the gums and coat, and match the treatment to what we find.

A wriggling youngster who was 3 kg at the last visit and is 4.5 kg now needs a bigger dose to get the same result, which is why nurse-led weight checks are worth slotting in between vaccinations.

The format is whichever one your pet will take without a fight: a liquid or paste for very young litters, a tablet buried in food for a puppy who eats anything, a spot-on between the shoulder blades for a cat with strong opinions about tablets. All of it is available at our four Devon surgeries, and we'll show you how to give the next dose at home.

Why Isn't One Dose of Wormer Enough?

One dose isn't enough because a wormer only reaches the adults already in the gut, and that is all any of them can do. Larvae migrating through muscle and liver ride out that first treatment and become egg-laying adults about a fortnight later. Clearing intestinal parasites takes a course rather than a single tablet.

Some larvae go further and simply wait. They wall themselves into tissue, sit dormant for months, then reactivate when hormones change, which is how a perfectly healthy bitch passes roundworm to a litter she was treated for long before she was pregnant. Kittens get theirs through the milk in much the same way.

A puppy then tops the burden up all day, mouthing everything in a garden where eggs may already be sitting in the soil. Reinfection isn't a sign the first treatment failed; it's the reason the schedule exists.

How Would I Know If My Puppy or Kitten Has Worms?

Most of the time you wouldn't know by looking, which is exactly what makes worms worth treating on a schedule. A young animal can carry a heavy burden and still seem bright, play hard and clear their bowl. The changes that do appear are vague: a dull coat, a swollen tummy, growth that lags behind the litter mates.

Soft stool in a puppy usually gets blamed on a change of food or the stress of a new home, and a heavy worm burden looks exactly the same from the outside.

By the time a puppy is pot-bellied and flat, or a kitten has stopped gaining weight, the problem has usually been building for weeks. Where a youngster isn't thriving and parasites are only one of several explanations, bring them in and we'll work through the other causes quickly.

Which Worms and Parasites Are We Treating For?

Six culprits account for most of what we find in youngsters. Roundworm, hookworm, whipworm and tapeworm are true worms; coccidia and Giardia are single-celled and need completely different medication. Roundworm is far and away the most common, and a great many puppies and kittens already carry it on the day they come home.

• Roundworm and hookworm: Puppies are commonly infected before they are born, because roundworms and hookworms cross the placenta and pass again through the mother's milk, and hookworm blood loss can leave a two-week-old dangerously anaemic. Eggs then persist in soil for years, so a garden that has hosted one infected litter stays a source long afterwards.
• Whipworm and tapeworm: Whipworm eggs are shed in bursts rather than steadily, and they come off soil, grass, and land grazed by livestock. Tapeworms arrive by way of a flea swallowed during grooming, and the first sign most families spot is what looks like grains of rice around the tail or in the bedding. Clearing tapeworm means sorting the fleas at the same time, or the next groom restarts the whole cycle.
• Coccidia and Giardia: Giardia is a protozoan rather than a worm, so a standard wormer does nothing to it, and cysts clinging to the coat let a puppy reinfect themselves days after treatment has finished. Coccidia is the other single-celled offender, common in kittens from busy or stressful settings, and it needs its own prescription too. Bathing at the end of a course, lifting faeces the same day, and hot-washing bedding and bowls are what break that loop.

Why Do We Ask for a Stool Sample?

Treating blind works well enough for the common worms and falls apart the moment something less usual is involved, which is why faecal testing turns a guess into targeted treatment.

Most samples run in our in-house laboratory, where a flotation technique concentrates eggs so they can be identified under the microscope. Giardia often needs a different method, and anything unclear goes to an external lab for confirmation. Whipworm and Giardia come and go in the stool, and one clear result in a youngster with ongoing diarrhoea is a reason to test again rather than to stop.

A fresh sample, collected that morning and brought along to routine health checks, is the easiest way to stay on top of it. Small scoops from two or three different parts of the stool give a better picture than one.

How Often Should Puppies and Kittens Be Wormed?

Parasite prevention guidelines put the first treatment at around two weeks of age, repeat it every fortnight until eight to sixteen weeks, then hand over to a monthly preventative that carries on year-round. That fortnightly gap isn't arbitrary, since it matches the time a fresh batch of larvae takes to grow into egg-laying adults.

Worming slots into visits that are already in the diary rather than adding new ones. The puppy and kitten vaccination course runs through the same weeks as the last of the fortnightly doses. A rescue or farmyard foundling with no history gets treated as though nothing has been done, because that's the safe assumption.

Does Worming Need to Carry On Through the Winter?

Stopping in autumn and starting again in spring leaves a gap, and year-round parasite prevention is now the standard because Devon winters rarely stay cold enough for long enough to interrupt a parasite's life cycle. Fleas breed happily indoors on the warm side of the wall, and slugs keep moving in mild, wet weather.

That last point matters locally. Lungworm is picked up when a dog eats a slug or snail, or licks a slime trail off a toy left out overnight, and it's a serious infection that not every wormer covers. If yours is the sort who mouths everything in the garden, tell us, because it changes which product we choose.

Travel shifts the picture too. Heartworm prevention costs a fraction of treating an established infection, which takes months of strict rest and carries real risk to the dog, and it matters most for pets travelling to or arriving from parts of southern Europe where the parasite is established.

Keeping cover going is mostly a memory problem, which is why a monthly preventative healthcare plan suits most households better than a note stuck to the fridge.

Does Every Puppy and Kitten Need the Same Cover?

Two youngsters in the same postcode can need quite different plans, because regional parasite prevalence shifts with climate, wildlife, and how much livestock is nearby. A farm dog and an indoor kitten don't belong on the same schedule.

What pushes exposure up is mostly a question of what goes in the mouth and what's underfoot:

• Outdoor access and hunting: gardens visited by foxes, hedgerow mice, and anything scavenged on a walk.
• Livestock contact: grazed land, farmyards, and the sheep fields plenty of our patients cross daily.
• Other animals: daycare, boarding, shows, and multi-pet homes where one positive stool involves everybody.
• Fleas in the house: tapeworm follows fleas, so flea control is worming control.
• Diet: raw food and caught prey both bring parasites along with them.

A cat who stays indoors, has no fleas and hunts nothing sits at the quiet end of that range and may need cover less often, though less often isn't the same as never. Our small animal care spans dogs, cats and the smaller pets in the household, and a routine appointment is where we work out where yours sits.

Can Worms Spread from Pets to People?

Several zoonotic parasites pass from pets to people through contaminated soil or faeces, and young children who play on the ground and anyone with a weakened immune system carry the highest risk.

Roundworm is the main concern. Eggs passed in stool need days to weeks in soil before they can infect anyone, so lifting them the same day does more than any other single measure. Hookworm larvae can pass through skin, which makes bare feet on contaminated ground the usual route. Giardia travels hand to mouth, and tapeworm would require swallowing an infected flea, something that happens occasionally in small children.

None of this means keeping children and puppies apart. It mostly means washing hands before tea.

Your Puppy and Kitten Worming Questions, Answered

Is the Wormer on the Supermarket Shelf Good Enough?

A supermarket wormer is sometimes the right product and often the wrong one, and the packet rarely tells you which. Plenty treat roundworm alone, the dose is pitched at a guessed weight, and neither helps when tapeworm, lungworm, or Giardia is the real problem. A dog product must never go on a cat: several contain permethrin, which is poisonous to cats in tiny amounts. Ring us at once if that happens rather than waiting for signs, and the Animal PoisonLine can advise out of hours. Our worming and preventative care settles the product and the timing if you would rather not weigh it up each month.

My Puppy Passed Worms After Treatment. Did Something Go Wrong?

Seeing worms in the stool for a day or two afterwards is normal, and it usually means the dose did precisely what it was meant to. Dead and dying adults are cleared out, and a heavy burden makes for a dramatic result in the garden. A looser stool or a subdued evening can come with it. Do ring us if vomiting repeats, the gums look pale, or your puppy goes off food, since a very young one can tire quickly.

We've Missed Several Doses. Is It Too Late to Catch Up?

Catching up is straightforward in most cases, and youngsters who started late still do very well. We'll weigh your pet, treat for what's most likely, and check a stool sample so nothing less usual is hiding behind the picture. Where growth has slowed or the gums look pale, a blood sample tells us whether anaemia needs addressing alongside the worming. From there we restart the fortnightly schedule from wherever you are now.

A Worming Plan That Fits Your Devon Household

Worms stay out of a growing puppy or kitten when the early fortnightly doses, the monthly cover that follows, and an occasional stool check all pull together. Let one slide and the other two end up doing work they were never built for.

The dates are the part that slips in the blur of those first few months, and we'd far rather hold them for you. The Vale Veterinary Group looks after puppies and kittens across Cullompton, Tiverton, Honiton and Uffculme, and our emergency service runs around the clock for registered clients if a youngster ever goes downhill fast. Bring your new arrival in for preventative health checks and we'll keep the schedule on track for you. If something doesn't look right in between, book an appointment at whichever of our centres is closest.