Ticks, Heartworm and Parasites You Forgot About in the UK

If your pet's previous life was in the UK, North America or northern Europe, you probably had a flea spray you used in summer, a tick check you did after walks in the woods, and a heartworm preventative your vet may not have even mentioned. That's all about to change.

This piece walks through the four parasite categories that come up in nearly every first vet appointment for newly arrived pets. It's general information — your vet will have local, specific recommendations that should override anything generic.

Fleas

Fleas in temperate climates are seasonal and household-dependent. Fleas in tropical Asia are continuous and almost universal. They feed on dogs, cats, rodents and humans, and they're the primary cause of one of the most common skin conditions you'll see in this region — flea allergy dermatitis, where a single bite triggers a severe inflammatory reaction.

Most modern flea preventatives can be effective, though product choice and local resistance patterns matter — your vet will know what's working in your area. Monthly oral or topical treatments are standard. The mistake owners most often make is treating fleas as a problem to be solved when they appear, rather than a problem to be prevented continuously.

Ticks

The brown dog tick (Rhipicephalus sanguineus) is the headline tick in tropical Asia. It transmits a number of serious bacterial and protozoal infections, the most common of which is ehrlichiosis. Untreated, ehrlichiosis can progress to a chronic form that's difficult to clear and damages bone marrow, kidneys and other organs.

Tick prevention takes two forms: medication (oral or topical) and physical inspection. Both matter. Medications kill ticks before they transmit disease, but no medication is 100% effective and ticks can attach in places easy to miss — between toes, inside ears, in the groin. A weekly tick check, especially after walks in vegetated areas, catches what medication doesn't.

If you find an attached tick, remove it with fine-tipped tweezers as close to the skin as possible, pulling steadily upward. Don't burn it, don't smother it in petroleum jelly, don't try to twist it out. Save the tick in a small container if you can — your vet may want to identify it.

Heartworm

Heartworm is transmitted by mosquitoes. The larvae enter through the bite, migrate through the body, and over months mature into adult worms that live in the heart and pulmonary arteries. Adult heartworm infection is serious, expensive to treat, and sometimes fatal. The treatment itself carries risk.

Prevention, by contrast, is straightforward and cheap. Monthly oral tablets or chews are standard for dogs; cats benefit from prevention too, though the disease in cats behaves differently. Heartworm preventatives don't kill mosquitoes — they kill the larval stage of the worm before it can mature. That's why missing a dose isn't a "today's a bit risky" situation but a "the entire month's protection just lapsed" one.

A heartworm test before starting prevention is standard, and most vets will test annually thereafter. If your pet has been on consistent prevention since arriving, your risk is very low — but the test is the safety net, not optional.

Intestinal worms and protozoa

Roundworms, hookworms, whipworms, tapeworms and giardia are all more present in tropical climates than in colder ones. Hookworm in particular thrives in warm, moist soil — meaning urban grass and parks in Singapore or Bangkok carry more risk than equivalents in London or Toronto.

Most monthly heartworm preventatives also cover several of these. Routine faecal testing — your vet will recommend a frequency — picks up what prevention doesn't. Pups, kittens and immunocompromised animals get more frequent monitoring.

What vets in the region typically recommend

The pattern, allowing for individual variation, looks like this:

• Monthly broad-spectrum preventative covering heartworm, intestinal worms, and (depending on the product) fleas and ticks.
• Additional tick coverage for dogs that walk in vegetated areas — sometimes a separate product.
• Annual heartworm testing regardless of consistent prevention.
• Routine faecal testing at intervals your vet decides based on lifestyle.

Specific products vary by city, by what's licensed locally, and by what your vet has seen work in their patient population. Asking "what do you put on your own dog?" is sometimes the most useful question you can ask in a first appointment.