Flea, tick and heartworm prevention in Australia: a year-round job

Parasite prevention in Australia is not a calendar cute enough to print on a fridge magnet from a northern-hemisphere brand. Mosquitoes that carry heartworm work the suburbs of Brisbane in June. Paralysis ticks work the east-coast escarpment after rain in spring and can still surprise a Sydney household in a mild winter. Fleas treat your carpet as the main property and the dog as a restaurant. The job is year-round in much of the country, and it is a conversation with a veterinarian — not a protocol copied from a group chat, and not a brand this desk is going to rank.

Products are one layer. Searching a dog for ticks is another. Cleaning the house for fleas is a third. None of those layers replaces the others.

Heartworm is a mosquito problem that looks like a heart problem

Heartworm (Dirofilaria immitis) lives in the heart and pulmonary arteries of infected dogs. Mosquitoes move the larval stages between animals. Cats can be infected too. Treatment of an established infection is involved, risky and expensive. Prevention is a routine.

Whether your dog needs year-round prevention is a veterinary judgement that should include where you live, where you travel, and how the dog lives. A Townsville backyard, a Melbourne inner-north courtyard, and a Tasmanian winter are not the same map — but “we don’t really get mosquitoes” is a poor substitute for a clinic that sees the local cases. Many Australian vets will recommend year-round prevention for dogs in endemic areas because mosquitoes do not read seasons as cleanly as people hope, and because missing a month is how coverage fails.

This guide will not name a chew, a spot-on or an injection as “the one”. Those choices depend on the animal’s age, weight, other medicines, and whether you also need flea or tick coverage in the same product. Missed doses, spat-out chews and a dog that swims every afternoon all change the plan. Ask the clinic. Ask them to write down what happens if you are a day late. Do not start, stop, or stack products because a kennel used something different at Easter.

Cats are not “small dogs” in this conversation. If you have an indoor-outdoor cat, or a cat that eats insects, ask whether prevention is recommended in your area. Do not apply a dog product to a cat.

Paralysis ticks are an east-coast emergency hiding in a weekend walk

The Australian paralysis tick, Ixodes holocyclus, is the one that should change how you come home from the bush, the beach and the long grass along a coastal creek. It is most notorious along the east coast — Queensland, New South Wales, and into eastern Victoria — in humid, vegetated country. Bandicoots and other wildlife are part of its life cycle. Your backyard can be enough if the habitat is right.

A female tick attaches and feeds. Over days, toxin can produce weakness that often starts in the hind legs, a change in bark or voice, retching, and trouble breathing. That is a same-hour veterinary emergency, not a wait-and-see. Search does not make you a clinician. Search makes you someone who might find the tick on the way out the door.

Daily tick search is a hands-on habit: start at the head, ears, eyelids, lips, collar line, between toes, armpits, groin, and under the tail. Run against the coat. A speck that was not there yesterday can be a juvenile. After a walk in likely habitat, do it again. Prevention products reduce the chance of attachment or survival; they are not a force field. People who skip the search because “he’s on the spot-on” are the people in the emergency waiting room explaining the product.

If you find an attached tick, the job is to get the animal to a vet, especially if there are any neurological signs. Some households are shown how to remove a tick for transport. Removal is not the same as treatment. An animal can still collapse after the tick is off. Do not cut the tick, burn it, or drown it in oil as a folk method. Do not treat a wobbly dog with a leftover tablet and a hopeful cup of tea.

Cats get paralysis ticks too, and they hide the early signs. A cat that cannot jump, has a changed meow, or is breathing with effort after outdoor time on the east coast is not “tired from hunting”.

Bushwalks, coastal camping and the move to a hinterland rental are when city dogs meet ticks they have no history with. If you are already thinking about heat and dogs on those same weekends, add the tick search to the water-and-shade routine. The pet first aid kit should include the clinic’s number and, if your vet has advised it, a tick remover for the trip in — not a home ICU.

Fleas: the pet is 5 per cent of the population

The fleas you see on a dog or cat are the minority. Eggs, larvae and pupae live in carpet, cracks, the boot of the car, the basket under the window, and the room the “indoor only” cat still visits. That is why a single bath, a single tablet, or a single vacuum on the sofa fails. The pupae wait. A visitor, a warm spell, or a vibration can hatch them into a new shift.

In southern winters people stop treatment because they are cold even if the fleas are not. In much of coastal and northern Australia there is no honest “flea off-season”. In Melbourne or Hobart the indoor environment — heating, carpet, a shared couch — can carry a population through July. Year-round prevention on the animals, plus washing of bedding in hot water and a vacuum that actually leaves the house (empty the canister outside), is the combination that works.

Flea allergy dermatitis is common. A small number of bites can wreck a skin-allergic dog. Treating “when we see one” is too late for that animal.

Again, no brand ladder here. Some products cover fleas only; some add ticks or heartworm. Some are unsafe in certain breeds, in pregnancy, or in combination. Cats die from dog-labelled permethrin products every year; that is a known, ugly, preventable error. Read the species line. Ask the vet. If a puppy or kitten is very young, the clinic — not the supermarket shelf — picks the first product.

If the house is already crawling, you need an environmental plan as well as an animal plan. A veterinary nurse can talk you through which rooms to wash and whether an environmental treatment is warranted. Do not fog a house with a product you have not cleared for birds, fish, children or a pregnant household member.

Make it a household system, not a memory test

Put prevention on a calendar you look at. Pair it with something that already happens — payday, bin night, the first Sunday. If more than one person is “in charge”, nobody is in charge. Write the date you last gave it on a card in the pantry. When you travel, take the product and the record. Boarding kennels will ask; so should you, of their other guests.

Puppies and kittens need a schedule that starts when the vet says it starts. Desexing visits are a good moment to ask the whole parasite question at once, including intestinal worms.

Coughing or a dog that seems older than its years can be many things, including heartworm. Do not start a prevention product on an adult dog with an unknown history until the vet has said whether a test is needed first. Tick paralysis signs go to hospital now. A flea storm gets a plan this week. Bring the packet of whatever you have been using.

Prevention in this country is unglamorous and slightly obsessive. That is the correct energy. Meet mosquitoes, ticks and fleas with a vet-set product, a daily pair of hands on a coastal dog, and a vacuum that does not live as decoration — in July as well as in January.