Heartworms And Your Dog
Heartworms are thankfully not found in the UK, but are a serious risk for dogs that travel abroad.
Transmitted by mosquitos, these parasites can cause serious illness and even death, so precautions should be taken for any dogs who leave the UK. Heartworms, called Dirofilaria immitis, are very thin, thread-worms that can reach up to 30cm in length. You won’t see these worms yourself though, as they live within the right side of the heart, and the main artery leading from the heart to the lungs.
Heartworms are nasty, and thankfully are not found in the UK. They are transmitted by mosquitos, and are therefore found in warmer countries, such as those in southern Europe.
Heartworms reproduce by producing tiny offspring, called microfilaria. These travel around the blood of infected dogs, and are ingested by mosquitoes when they bite and feed. These microfilaria can then live within the mosquito, and be passed on to the next dog that the mosquito feeds on.
The maturation process for heartworm is slow, and it can take six months for the worms to even reach the heart after an infection starts. The slow progression of this infection means that even dogs who have not travelled for some time should still be considered as ‘at risk’ of developing heartworm unless they have had appropriate parasite treatments.Read more about common pet parasites Find a practice
More about heartworms
If your dog doesn’t leave the UK, there is no current risk of them being infected by heartworms. However, as Pet Passports become more common, and more dogs travel on holiday with their owners, the number of cases of heartworm diagnosed in the UK is likely to increase.
Heartworms are spread through the bites of mosquitos that carry the infective heartworm larvae. Dogs are at risk of developing heartworm if they have:
- Not been given preventative medication
- Spent time in a region with mosquitos and heartworms
How serious the symptoms of a heartworm infection are depend on the number of heartworms, how long the infection has been present and the immune response of your dog.
Infected dogs fall into one of four classes:
- No signs or very mild. Dogs may only have an occasional cough.
- Dogs are coughing more regularly and are starting to show evidence of struggling with exercise.
- Infected dogs lose weight, find exercise very difficult, have laboured breathing and are starting to show evidence of right-sided heart failure, such as a build-up of fluid in the abdomen.
- The most severe cases develop caval syndrome, where the sheer number of worms blocks the flow of blood into the heart. Sadly dogs with caval syndrome usually die.
Heartworm preventative medication is the best way to protect your dog from contracting heartworm on holiday. Your vet can advise what the best preventative medication would be for your pet, and give you some to take with you if you will be away for a longer period.
Even missing a single dose will put your dog at risk of contracting heartworm, so it is important up-to-date with treatments.Read more about our health plans