How often should you worm your dog or cat? A complete worming guide

Worms are one of those topics most pet parents only think about when something seems off, but knowing how often to worm a dog or cat before that happens makes everything so much simpler. This guide covers the worms most likely to affect your pet, how a worming schedule changes from puppyhood through to the senior years, and what your pet’s lifestyle tells you about how often they really need treating. By the end, you’ll have a clear, practical routine you can actually stick to. How often should you worm a dog or cat? Start with the basics Worming your pet is one of those things that’s easy to put off — until you find yourself Googling “how to tell if a dog has worms” at 11pm because your dog has been scooting across the carpet. Sound familiar? Once you understand the basics, though, it really is straightforward to stay on top of. So, how often should you worm a dog or cat? The honest answer is: it depends on their age, lifestyle, and where they spend their time. As a starting point, most adult dogs and cats need worming every three months. Puppies and kittens need it far more frequently — sometimes as often as every two weeks in those earliest weeks of life. We’ll get into all of that further down. What worming treatments actually do is target internal parasites that can quietly take up residence in your pet’s gut, or occasionally other organs, without any obvious signs. Some pets show clear clues: weight loss, a rounded belly, or worms visible in their stool. Others seem perfectly fine. That’s exactly why a regular schedule beats a reactive one every time. Dogs and cats also have slightly different needs. Dogs tend to pick up worms through scavenging, eating grass, or contact with other dogs on walks. Cats, especially those who hunt, face their own set of risks. A good routine accounts for how your pet actually lives, not just the textbook version of their species. This guide covers everything: which worms to know about, how a dog worming schedule shifts with age, what factors change how often you should treat, and how to build a habit that genuinely sticks. You can also browse our flea and worming treatments if you want to get sorted while you read. Which worms are we talking about, and how do pets pick them up? Most dogs and cats will pick up worms at some point in their lives — it’s just part of being a curious, sniff-everything, roll-in-anything kind of animal. Knowing which worms to look out for, and how pets actually come into contact with them, makes it so much easier to build a worming routine that sticks. The main worms to know about: Roundworm — the most common type, especially in puppies and kittens. These live in the gut and can cause a pot-bellied appearance, vomiting, and poor growth. Tapeworm — flat, segmented worms that attach to the gut lining. You might spot small white segments around your pet’s bottom or in their bedding. Hookworm — less common, but worth knowing about. These latch onto the intestinal wall and feed on blood, which can cause anaemia in younger or smaller animals. Whipworm — more of a dog problem than a cat one. They live in the large intestine and can cause bloody diarrhoea and gradual weight loss. How do pets pick them up? Sniffing or accidentally swallowing infected faeces on walks or in the garden Hunting or scavenging — eating birds, rodents, or other small animals Fleas — swallowing an infected flea during grooming is one of the most common routes for tapeworm Sharing outdoor spaces with other dogs, cats, or wildlife Mother-to-puppy or mother-to-kitten transmission, either during birth or through nursing That last point matters more than most people realise. Puppies and kittens arrive in the world already vulnerable, which is why those early weeks call for extra care. Good puppy flea and worming treatments can make a real difference right from the start. How often to worm a dog or cat comes down to age, lifestyle, and risk level — and we’ll work through all of that next. The usual worming schedule by age: puppies, kittens, adults and seniors Worming frequency shifts quite a bit depending on where your pet is in life, so treat the schedule below as a practical starting point rather than a fixed rule. The exact timing will always come down to the product you’re using and how your pet actually spends their days. Life Stage Recommended Frequency Key Reason Puppies Every 2 weeks until 12 weeks old, then monthly until 6 months Worm burdens are high in young pups, and maternal transmission is common Kittens Every 2 weeks until 12 weeks old, then monthly until 6 months Kittens are particularly vulnerable and often pick up worms through their mother’s milk Adult Dogs Every 3 months as a minimum Keeps protection consistent against roundworms and tapeworms throughout the year Senior Dogs Every 3 months, reviewed with your vet Older pets may have weaker immune systems, and changing health needs can affect what treatment works best Once your dog or cat reaches adulthood, a quarterly routine covers most households well. That said, some pets genuinely need worming more often, and it’s worth thinking this through before you settle on a schedule. You might want to worm more frequently if your pet: Spends a lot of time outdoors, rooting through grass, puddles, or woodland Hunts or scavenges, even now and then Mixes regularly with other dogs, cats, or animals at parks, kennels, or training classes Lives with young children, who are more vulnerable to certain worm infections For example, a Labrador who swims in every pond he passes and lives for a good rummage in the undergrowth is a different case to a greyhound who sticks to pavement walks and rarely meets other dogs. Same species, very different risk. If you have a large adult dog and want a reliable treatment to keep on hand, our worming tablets for large adult dogs slot neatly into a quarterly routine. Whatever product you choose, always follow the guidance closely, and if your pet’s lifestyle puts them in a higher-risk category, a quick chat with your vet will help you get the timing right. What changes the answer? Lifestyle, risk and the way your pet lives Standard worming schedules give you a solid starting point, but they don’t tell the whole story. Every pet lives a different life, and some lifestyles genuinely put dogs and cats at greater risk of picking up worms more often. Working out how often to worm a dog really comes down to understanding what your pet actually gets up to day to day. Here are the key factors that can push the risk higher: Raw feeding. Raw meat, particularly offal, can carry worm larvae. Dogs and cats on a raw diet are more exposed than those eating cooked or commercial food. Hunting or catching prey. Cats that bring home birds or mice, or dogs that snap at rabbits on walks, are repeatedly exposed to intermediate hosts that carry worms. Scavenging on walks. If your dog is the type to hoover up anything they find on the ground, their risk goes up every single time you leave the house. Homes with young children. Children play close to pets and often put their hands in their mouths, which raises the stakes around roundworm transmission in particular. Multi-pet households. More animals sharing a space means more opportunity for reinfection, especially if one pet picks something up outdoors and brings it home. Frequent boarding or daycare. Regular contact with lots of other dogs increases exposure. It’s that simple. Inconsistent flea treatment. Fleas and worms are more closely linked than many owners realise. Gaps in flea cover can leave your pet more vulnerable than you’d expect. The more of these factors that apply to your pet, the more likely they are to need worming more frequently than the standard schedule suggests. That last point about fleas is worth pausing on. Fleas can transmit tapeworms directly, which makes the two genuinely inseparable. Keeping on top of both isn’t doubling your workload — it’s just good sense. If you want to review what you’re using, our flea and worming treatments are a good place to start. How to worm your pet safely without the guesswork Getting worming right feels complicated at first, but once you’ve done it a couple of times, it genuinely isn’t. Whether you’re figuring out how often to worm a dog for the first time or just trying to be more consistent, a few simple habits make it easy to stay on top of. Choose a species-appropriate product. Always use a wormer made specifically for dogs or cats. They are not interchangeable — and using the wrong one can cause serious harm. Dose by weight, not by guesswork. Weigh your pet before each treatment and follow the label closely. Too little won’t work; too much creates unnecessary risk. Set a recurring reminder. Tying your dog worming schedule to something you already remember — the first of the month, a pet’s birthday, a regular vet visit — means it becomes habit rather than something you have to think about. Don’t double dose if you miss one. Simply treat as soon as you remember and reset your schedule from there. No need to compensate. Never use a dog product on a cat. Some ingredients that are perfectly safe for dogs are toxic to cats. This one really matters. When to speak to a vet first: Pregnant or nursing pets Very young animals (a vet can give you a tailored plan if you’re unsure how often to deworm a puppy in those early weeks) Pets with existing health conditions or on other medications It’s also worth staying alert to the signs your dog has worms between treatments — things like changes in appetite, a bloated belly, or visible worms in their stool. Caught early, it’s rarely a big deal. And if you want trusted support between vet visits, our vet-approved wellbeing range is a good place to explore. Building a routine that’s easy to stick to Once you know how often to worm a dog or cat, the real challenge is turning that knowledge into a habit you’ll actually keep. The good news? A little planning upfront makes it almost effortless to maintain. The simplest approach is to tie worming into something you already do. If you apply flea treatment on the first of the month, add worming to the same date. Some products cover both, which makes things even easier. A sticky note on the fridge, a recurring phone reminder, or a note in your pet’s health file all do the job — whatever suits the way your brain works is the right system. It also helps to keep treatments in stock so you’re never caught short. Running out mid-schedule is one of the most common reasons routines slip, and it matters most with puppies and kittens who need worming every two weeks. If you share care of your pet with a partner or family member, agree on who’s responsible. It sounds obvious, but a quick “did you worm them this month?” conversation avoids a surprising amount of confusion. It’s also worth thinking seasonally. Autumn walks bring more mud, more wildlife contact, and more opportunities for a dog to sniff out something they shouldn’t — all of which can increase worm risk. Our autumn pet care guide covers everything you need to keep your dog or cat healthy as the seasons change. The routine doesn’t need to be complicated. Consistent and simple is genuinely all it takes. Frequently Asked Questions Can you overworm a dog? Yes, giving more wormer than the label recommends creates unnecessary risk. The safest approach is to use a dog-specific product, weigh your dog before each treatment, and follow the dosing instructions closely. If you miss a dose, treat when you remember rather than doubling up to compensate. What are the signs that a dog needs worming? Common signs include weight loss, a bloated or rounded belly, changes in appetite, vomiting, scooting, and visible worms or white tapeworm segments in your dog’s stool or around their bottom. Some dogs show no obvious signs at all, which is why a regular worming routine matters. Can I deworm my dog again after 2 weeks? Yes, in some cases worming again after 2 weeks is part of a normal schedule, especially for puppies in their earliest weeks. For adult dogs, timing depends on the product and your dog’s lifestyle, so follow the label carefully rather than repeating doses early without a reason. Is one round of dewormer enough? No, one round of dewormer usually isn’t enough as a long-term plan. Most adult dogs need worming every 3 months as a minimum, while puppies need it much more often at first. A regular schedule works better than only treating once or waiting until you spot signs.

By Adele Busby