It can be alarming to discover that your dog has worms but it should not come as a surprise. All pets are affected at some stage in their life and many will be re-infected unless they are given regular, routine worming treatment. Except in rare cases, worms are unlikely to cause serious harm. Getting rid of worms is relatively simple and inexpensive so regular treatment is strongly recommended, particularly as some types of worm can be passed onto humans.

We recommend that you worm your pup every 2 weeks until he/she is 6 months old and then every 3 months thereafter. If you have any questions about worms or worming, please make an appointment or Contact Us

What worms are found in dogs?

There are two important types of parasitic worm in dogs – roundworms and tapeworms. Roundworms can grow up to 15 cm long and are white in colour. As their name suggests they are round (like string), whereas tapeworms are flat (like ribbons).

Tapeworms can grow up to 60 cm long. Both roundworms and tapeworms live in the dog’s intestines along with two other types of smaller worm (similar to roundworms) called whipworms and hookworms. However, these rarely affect dogs in the Ireland. In some countries there are parasitic worms that can live in the dog’s lungs, heart, stomach or bladder but these are rarely seen in Europe.

What damage do worms cause?

Intestinal worms help themselves to your dog’s food and can damage the gut causing loss of blood. Worms can also cause diarrhoea, dehydration and anaemia, and this may make your dog run-down and susceptible to other diseases. If there are a lot of worms your dog may cough, lose weight, have a rough, dry coat or a ‘pot-bellied’ appearance.

In puppies a worm infection can be more serious, causing poor growth and sometimes death. If there are large numbers of worms the intestine can become blocked (although this is rare in an adult dog) and this may be fatal.

How are worms passed on?

Roundworms grow in the intestine laying thousands of eggs, which pass out in the faeces (droppings). The eggs can survive for months or even years in the soil and need to lie in the environment for some time before they can infect another animal. They find their way into a new host either directly, (when eaten by a dog) or indirectly, (after being swallowed by a rodent which is then eaten by the dog). Immature worms also survive in the tissues of an infected dog. If the dog is female and has puppies they make their way to the dog’s breast and are passed to the puppies in the milk.

Tapeworms are anchored to the intestinal wall. They grow a continuous ribbon of segments that are each packed with eggs. The segments gradually break off and are passed out of the dog’s bottom. They may wriggle like a maggot for a short time and then dry up (sometimes still attached to your dog’s fur). The most common type of tapeworm re-infects a new dog by way of fleas. Immature fleas live in the environment and eat a variety of solid food including dog faeces (droppings). The next dog will become infected when it swallows an adult flea whilst grooming itself. There is also a less common type of tapeworm that uses mice, other rodents and rabbits to complete its life cycle. The parasite forms inactive cysts in muscle or other organs of the host and your dog is then infected if it eats a small rodent or rabbit.

How can I tell if my dog has worms?

Apart from the general effects on health described above, signs of infestation are to be found in your dog’s faeces (droppings). Puppies may vomit or pass round worms (looking like string) in their faeces. Segments of tapeworm (looking like grains of rice), can often be seen in the droppings or in the fur around its bottom. You may be startled to see them move. Roundworm eggs can only be seen using a microscope.

How can worms be destroyed?

There are some highly effective treatments that will kill worms. These are available as liquids, tablets or spot-on application. However, not all the products are equally good and some work against certain types of worms and not others. Your vet will be able to advice you on which product is best for your dog. Worms are so common that it is safe to assume that any puppy, dog with fleas, or animal that regularly catches wildlife will be infected. Puppies should be dosed every two weeks, from four weeks to 16 weeks of age, and older dogs should be treated about every three months. You should discuss with your vet the most appropriate treatment regime for your pet.

Can my family or I be affected?

The common roundworm found in dogs is a rare but potentially serious cause of human disease. The larval stages burrow through the gut wall and become embedded somewhere within the body and can cause serious damage if they end up, for example, in the eye. There are occasional reports of the victim, usually a child, being blinded in one eye.

What can I do to reduce the risk?

Apart from regularly worming your pets, there are a number of other measures which can stop worms being passed on from dog to dog, or from dog to people. If your dog uses your garden as a toilet, clean up the faeces (droppings) and bury them or put them inside a sealed bag in your dustbin.

Check your dog for signs of fleas and treat them regularly using the product recommended by your vet. Fleas are more numerous during summer and autumn. Children will put dirty fingers and other objects into their mouths and this may bring them into contact with worm eggs. Make sure that they wash their hands after playing in a garden or other open areas that may be used as a toilet by dogs. Remember the greatest risk of children being infected with worms is from other children, not your dog.