Signs Your Pet Has Worms

Worms are a common problem in dogs, cats, and some small pets, and many owners are surprised to learn that infected animals do not always look obviously unwell. In some cases, pets can carry worms with only mild signs at first, which is why regular parasite prevention is such an important part of everyday pet care.

Understanding the common symptoms of worms can help you spot potential problems early and get the right advice for your pet. In this guide, we explain what signs to look out for, when treatment may be needed, and when it is best to speak to your veterinary surgeon.

This article is intended for general guidance only and should not replace professional veterinary advice. If your pet is unwell or showing concerning symptoms, please contact your veterinary surgeon.

What are worms in pets?

Worms are internal parasites that live inside the body, usually in the intestines, although some types can affect other organs. The most commonly discussed worms in UK pets include:

• Roundworms – common in puppies and kittens, but can affect adult pets too
• Tapeworms – often linked to fleas in dogs and cats
• Hookworms – less common, but can cause digestive upset and blood loss
• Lungworms – mainly seen in dogs and potentially serious if left untreated

Different worms cause different symptoms, and some pets may have no obvious signs at all. This is one reason why routine preventative treatment and regular vet checks matter. If you are looking for parasite prevention options, our flea, tick and worming collection can help you explore suitable products for different pets.

Common signs your pet may have worms

The symptoms of worms can vary depending on the type of worm, your pet’s age, and how heavy the infestation is. Below are some of the more common signs owners may notice.

Visible worms or worm segments

Sometimes the first clue is actually seeing worms. You may notice:

• Worms in your pet’s poo
• Worms in vomit
• Small white segments around the bottom or bedding that look a little like grains of rice, which can be tapeworm segments

If you see anything unusual, it is sensible to contact your veterinary practice for advice, as identifying the type of parasite can affect which treatment is most appropriate.

Weight loss

Pets with worms may lose weight even if they seem to be eating normally. This happens because the parasites can interfere with how nutrients are absorbed or compete for the food your pet eats. In growing puppies and kittens, this is especially important, as worms can affect normal development.

A bloated or pot-bellied appearance

A swollen tummy can sometimes be seen in young animals with roundworms. Puppies and kittens may appear pot-bellied despite being otherwise thin. While worms are one possible cause, abdominal swelling can also happen for other reasons, so it is always worth getting your pet checked if you are unsure.

Changes in appetite

Some pets with worms become hungrier than usual, while others may lose interest in food. Either change can be a sign that something is not quite right. Ongoing appetite changes should be discussed with your veterinary surgeon, especially if they are combined with weight loss, diarrhoea, or vomiting.

Diarrhoea or vomiting

Digestive upset is another common sign. Pets with worms may develop:

• Loose stools
• Occasional or repeated diarrhoea
• Vomiting
• Mucus in the stool

These symptoms can have many causes, not just worms, so it is important not to assume. If your pet has severe diarrhoea, repeated vomiting, or seems lethargic, seek veterinary advice promptly.

Scooting or irritation around the bottom

Dogs and cats sometimes drag their bottom along the floor, often called scooting. This can happen if tapeworm segments are causing irritation around the anus. However, scooting can also be linked to anal gland problems, skin irritation, or other issues, so it is not a definite sign of worms on its own.

Dull coat or poor condition

If your pet’s coat looks less shiny than usual, or they seem generally out of condition, parasites may be one possible reason. Worms can affect the body’s nutritional balance, which may show up in coat quality, energy levels, or overall condition.

Coughing or breathing changes

In dogs, lungworm can sometimes cause coughing, breathing difficulties, tiring easily, or unusual bleeding problems. Lungworm can be serious and should not be ignored. If your dog has breathing changes, collapses, or seems very unwell, contact your veterinary surgeon urgently.

Signs of worms in dogs

Dogs can pick up worms in several ways, including from contaminated soil, eating infected prey, grooming themselves after exposure, or swallowing fleas carrying tapeworm larvae. Common signs in dogs include:

• Diarrhoea
• Vomiting
• Weight loss
• A pot-bellied abdomen, particularly in puppies
• Scooting
• Worms or segments visible in poo
• Coughing in some cases, particularly with lungworm

Routine prevention is especially important for dogs that spend a lot of time outdoors, scavenge, hunt, or mix regularly with other dogs. You can browse our dog flea and worming products if you are reviewing your dog’s parasite protection plan.

Signs of worms in cats

Cats may catch worms from hunting, fleas, contaminated environments, or from their mother when very young. Many cats show only subtle signs, but symptoms can include:

• Weight loss
• Vomiting
• Diarrhoea
• A dull coat
• Increased or reduced appetite
• Visible worm segments around the bottom or in bedding

Outdoor cats and cats that hunt are often at higher risk, but indoor cats can also be affected, particularly by tapeworms linked to fleas. If you need to review parasite treatments for your cat, our cat flea, tick and worming products may be helpful to explore alongside veterinary advice.

What about rabbits and small pets?

Some small pets can also be affected by internal parasites, although the types of worms and the level of risk vary between species. Signs are often quite general, such as weight loss, digestive upset, or poor condition. Because small pets can become unwell quickly, it is best to contact a vet if you notice any ongoing change in appetite, droppings, or behaviour.

For a wider range of products for smaller companions, you can visit our small animal collection.

When treatment may be needed

If your pet has symptoms that could suggest worms, treatment may be needed, but it is important to use the right product for the right parasite. Not all wormers treat all types of worms, and some treatments are only suitable for certain species, ages, or weights.

You should consider speaking to your veterinary surgeon if:

• You have seen worms or worm segments
• Your pet has digestive symptoms that are not settling
• Your pet is losing weight
• Your puppy or kitten has a swollen belly
• Your dog may be at risk of lungworm
• You are unsure which worming treatment is suitable

If your pet has been prescribed a worming treatment, we can help you order it safely through our prescription ordering process. You can also read our prescription FAQs if you would like more information about how it works.

Why regular worming matters

Regular preventative treatment helps reduce the risk of worms building up and causing illness. The most suitable schedule depends on your pet’s age, lifestyle, and risk factors. For example, young animals often need more frequent worming than healthy adults, and pets that hunt or spend a lot of time outdoors may need carefully planned protection.

Good parasite control is also important for household hygiene, as some worms can potentially affect people. Simple preventative steps include:

• Using regular flea and worm prevention where recommended
• Picking up dog poo promptly
• Keeping litter trays clean
• Washing hands after handling pets or cleaning up after them
• Controlling fleas, as fleas can spread tapeworms

When to contact your veterinary surgeon urgently

Most worm infestations can be managed effectively, but some situations need quicker advice. Contact your veterinary surgeon promptly if your pet:

• Is very lethargic or weak
• Has repeated vomiting or severe diarrhoea
• Has blood in their vomit or stool
• Is struggling to breathe or coughing persistently
• Is a very young puppy or kitten with a swollen tummy and poor appetite
• Seems unwell in any way that is worsening

These signs may be caused by worms, but they can also point to other health problems that need veterinary assessment.

Choosing pet worming products responsibly

It can be tempting to buy the first product you see, but effective worm control should always be based on your pet’s needs. Age, body weight, species, lifestyle, and existing medical conditions all matter. Responsible use helps avoid underdosing, using the wrong treatment, or missing an important diagnosis.

At Vetscriptions, we aim to make it easier for UK pet owners to access genuine pet medicines and healthcare products with clear guidance and support. If you are not sure where to start, you can also contact us for help with product information or ordering, while remembering that diagnosis and treatment advice should come from your veterinary surgeon.

Conclusion

Worms in pets are common, but the signs are not always obvious. Weight loss, vomiting, diarrhoea, a bloated tummy, scooting, or visible worm segments can all be clues that something is wrong. Early recognition and appropriate treatment can help protect your pet’s health and comfort, while regular preventative care can reduce the chance of future problems.

If you are concerned that your dog, cat, or small pet may have worms, speaking to your veterinary surgeon is the best next step. If treatment is prescribed, we are here to help you order responsibly and conveniently, and you can also browse our flea, tick and worming range for everyday parasite care products.

For more pet health support, prescription guidance, and trusted products, explore more about us at Vetscriptions and continue learning how to support your pet’s wellbeing with confidence.