Spring Pet Health Guide: Allergies, Parasites and What to Watch For in Australia
Spring is the season when three separate problems land on Australian dogs and cats at the same time. Paralysis ticks become active again along the east coast, fleas breed faster in the warmth, and the pollens that trigger skin allergies climb. If you do one thing this month, check that your pet is on current parasite prevention and that the product you are using actually covers the parasites in your area. A prevention gap that opened quietly over winter becomes a real risk from September onward.
Below is what changes in spring, what to look for in your own dog or cat, and the label checks that tell you what your product does and does not do. None of this replaces a conversation with your own vet, who knows your pet, your postcode and your pet history. It is here so you know what to ask.
What actually changes for pets in spring?
Warmth and humidity speed up parasite life cycles. Fleas move through egg, larva, pupa and adult far more quickly in spring than they do in July, which is why a flea problem can seem to appear overnight when it has in fact been building in your carpet and bedding for weeks. Ticks become more active in the same conditions. Grasses and weeds flower and then set seed, which raises airborne pollen and, a few weeks later, drops barbed seed heads into every park and nature strip your dog walks through. Snakes come out of winter inactivity. And most owners simply spend more time outside with their pets, which multiplies the exposure to all of the above.
The practical consequence is that spring is the worst month to be running late on prevention, and the best month to get organised. If you worked through our winter health checklist a few months ago, treat this as the seasonal handover: the cold weather problems recede and the parasite, allergy and grass seed problems take their place.
Why do paralysis ticks come back in spring?
The Australian paralysis tick, Ixodes holocyclus, is found along the east coast in a band that runs roughly from north Queensland down through New South Wales to eastern Victoria, concentrated close to the coast. Published research on the seasonality of this species consistently reports that tick activity and tick paralysis cases in companion animals peak in spring and early summer. In the warmer northern parts of that range, ticks can be found throughout the year, so prevention there is not a seasonal decision at all.
That geography matters if you are going anywhere with your pet this season. A dog that lives outside the tick band and holidays inside it needs cover for where it is going, not where it lives, and our guide to parasites and pet travel covers what changes when you cross regions.
Both dogs and cats are affected. Cats are frequently overlooked in tick conversations, partly because owners assume an indoor and outdoor cat is at lower risk and partly because cats hide illness well. They are not immune.
Tick paralysis is an emergency. It is not a wait and see condition, and it can progress quickly once signs appear. Get to a vet immediately if you notice any of the following in a dog or a cat:
• A change in voice, so a different sounding bark or a hoarse or altered meow
• Coughing, retching, gagging or vomiting
• Wobbliness or weakness in the back legs, which typically progresses forward
• Any change in breathing, including faster, noisier or laboured breathing
• Loss of appetite or sudden lethargy in a pet that has been outdoors
Searching your pet is worth the two minutes it takes. Work your fingertips through the coat down to the skin rather than looking at the coat, and cover the head, around and inside the ears, the lips and chin, under the collar, the neck and shoulders, the armpits and between the toes. Ticks attach anywhere but are commonly found on the front half of the body. If you find one, your vet can show you how to remove it safely, and it is worth keeping a tick removal tool in the car. Removing a tick does not mean the risk has passed, so still speak to your vet, particularly if your pet has any of the signs above.
How do I know if my flea and tick product covers paralysis ticks?
This is the single most useful thing a pet owner can learn to check, and the answer is printed on the box.
Under the APVMA Veterinary Labelling Code, a product for dogs or cats that claims tick control but does not control the paralysis tick must carry a statement on the label saying that it does not control paralysis tick (Ixodes holocyclus). Products that do claim control of that species must carry a statement noting that Ixodes holocyclus ticks do not occur in Western Australia. In other words, the regulator has already required the manufacturer to answer your question in plain language, and you only have to read it.
Three related points that catch people out:
• A flea product is not a tick product. Plenty of well known flea treatments for dogs and flea, tick and mite treatments for cats make no paralysis tick claim at all, and there is nothing wrong with that, but a flea-only product is not the one to rely on in a paralysis tick area. The tick statement on the label tells you which you have.
• Protection periods differ between products and are stated on the label. Diarising the next dose the day you give one is a far more reliable system than remembering.
• Many ectoparasiticide labels carry an age contraindication for young animals, commonly for kittens and puppies under three months of age. If you have a new puppy or kitten this spring, that is a conversation to have with your vet rather than an assumption to make.
If you are not sure what your current product covers, the label and your own vet will tell you. We will not tell you one product is better than another, because that is a clinical judgement about your specific animal, in your specific area, and it depends on things a website cannot see.
Why you must never use a dog product on a cat
This one matters more than any other paragraph on this page, because getting it wrong kills cats.
Some spot-on flea and tick products for dogs contain permethrin. Dogs metabolise permethrin without difficulty. Cats lack the liver enzyme pathway needed to break it down, so it accumulates, and the result can be severe illness or death. This is well documented in Australia, and it is the reason the APVMA requires dog spot-ons containing permethrin to carry specific warning statements. Those labels direct owners to keep cats separated from recently treated dogs, note that toxic effects have been reported in cats that groom or contact dogs treated up to 48 hours earlier, list those effects as including behaviour changes, drooling, tremors and death, and instruct owners to seek veterinary advice immediately if toxicity in a cat is suspected.
So the rules in a household with both a dog and a cat are:
• Never apply a product labelled for dogs to a cat, at any dose. Splitting a dog pipette does not make it safe for a cat.
• Check the active ingredients of your dog product. If it contains permethrin, follow the separation instruction on the label rather than treating it as optional.
• Apply treatments where the other animal cannot get to the application site, and keep them apart for the period the label specifies.
• If your cat has contacted a treated dog and is drooling, twitching, tremoring or behaving oddly, treat it as an emergency and phone your vet on the way.
The species named on the label is not a marketing decision. It is the safety boundary the product was approved within.
What causes spring allergies in dogs and cats?
Allergy signs that flare in spring usually trace back to one of three routes, and it is common for a pet to have more than one at the same time.
Environmental allergens
Grass, weed and tree pollens rise through spring, alongside dust mites and moulds that are present year round. Dogs generally do not respond to these the way people do. Rather than sneezing and watery eyes, a dog with environmental allergy usually shows it in the skin, and the itch tends to concentrate on the paws, face, ears, belly, armpits and groin.
Flea allergy
Some dogs and cats are hypersensitive to proteins in flea saliva, and in a sensitised animal a very small number of bites can trigger a disproportionate reaction. This is the reason your vet will ask about flea control even when you have not seen a single flea. You are not being doubted. In a flea allergic pet, the fleas you cannot find are still the problem, which is why consistent year round flea control is part of managing the skin rather than a separate task.
Contact irritants
Newly treated lawn, a new washing detergent on bedding, or a plant they have started lying under can all produce a localised reaction, usually on the belly, chest, chin or paws where the contact happened.
What do spring allergies look like?
In dogs, watch for licking or chewing the paws, particularly the same paw repeatedly, rubbing the face along furniture or carpet, scratching the belly, armpits and groin, head shaking, redness in the skin folds, hair loss in patches, and skin that has thickened or darkened where it has been irritated for a long time. Ear irritation that keeps coming back is very often allergic skin disease showing up in the ear canal rather than a separate ear problem.
In cats, the picture is quieter and easier to miss. Cats groom privately, so over-grooming often presents simply as thinning fur or symmetrical bald patches, most commonly on the belly, inner thighs or along the flanks. You may also see small scabs, particularly around the neck and head, or a cat that is scratching at its ears more than usual. Many owners only realise there is a problem when they notice more hairballs than normal.
Two cautions here. First, all of the above overlaps with mites, fungal and bacterial infections, and several conditions that have nothing to do with allergy, so what looks obvious to an owner is frequently something else. Your own vet needs to examine your pet to work out which. Second, and this is important: do not give your dog or cat medicines from your own bathroom cupboard. Human medicines are formulated for humans, several are dangerous to pets, and human dosing does not translate to animals by body weight. If your pet needs something, it needs something registered for its species and prescribed or recommended for it.
Are grass seeds really a problem?
Yes, and spring into early summer is exactly when they become one. As seed heads dry, the barbed varieties detach easily and catch in fur. Because of the way the barbs are angled, they only travel in one direction, which is inward. Common destinations are the ear canal, the webbing between the toes, under an eyelid and up the nose. They do not work their way back out on their own.
The signs are usually sudden and one sided:
• Violent head shaking or holding one ear down, often starting during or straight after a walk
• Persistent licking or chewing at one paw, sometimes with a small swelling between the toes
• A sudden fit of sneezing that starts outdoors and does not settle
• One eye squinting, watering or held closed
These need a vet appointment rather than home treatment, because the seed has to be found and removed, and it migrates further the longer it stays. Prevention is unglamorous and effective: check ears, paws and coat after walks through long grass, keep the feathering around the paws trimmed in long coated dogs, and keep your own lawn down.
What about worming in spring?
Two things change. Warmer, wetter conditions favour the survival of some intestinal worm stages in the environment, and rising flea numbers matter because fleas are involved in the tapeworm life cycle. If your flea burden goes up in spring, tapeworm risk goes up alongside it, which is another reason flea control and worming are best thought of as one routine rather than two.
Worming intervals differ by product, by the age of the animal and by its lifestyle, and puppies and kittens follow a different schedule to adults. Rather than guessing, follow the directions on the label of the product you are using and ask your vet what interval suits your pet. If you have moved house, added a pet, or your dog has started swimming or hunting more, the answer may have changed.
If you are restocking this spring, our worming products for dogs and worming products for cats are listed separately by species, which is the first thing to get right before you look at anything else on the pack.
What about snakes?
Spring is when snakes become active again, and dogs investigate with their nose while cats investigate with their paws. Both are effective ways to get bitten. Signs of envenomation can include sudden collapse followed by an apparent recovery, vomiting, dilated pupils, weakness that begins in the back legs, and laboured breathing.
If you suspect a bite, this is an immediate emergency. Keep your pet as still and calm as possible, do not try to find, identify or catch the snake, and phone the vet as you leave so they can prepare for your arrival. Do not wait to see whether your pet improves, because an apparent recovery early on is a recognised part of the pattern rather than a sign that it is over.
Your spring checklist
Working through this once in early spring covers most of the season:
1. Check the expiry and the last dose date on your current flea, tick and worming products for each pet by name, not from memory.
2. Read the tick statement on the label and confirm whether it covers paralysis tick, if you live in or travel to the east coast band.
3. Confirm every product is labelled for the species you are giving it to, and check whether your dog product contains permethrin if you also own a cat.
4. Diarise the next dose for every pet, on the day you give this one.
5. Start a daily tick search habit for dogs and cats that go outside, especially after bush or coastal walks.
6. Photograph any skin change, hair loss or bald patch when you first notice it, so your vet can see how it has progressed.
7. Check ears and paws after walks through long grass.
8. Book the appointment now if your pet had a bad spring last year. Skin conditions are far easier to manage before they are inflamed and infected than after.
When should you go straight to the vet?
Do not wait for an appointment slot next week if you see any of these in a dog or a cat:
• Any change in voice, breathing or the ability to walk normally
• Weakness in the back legs, wobbliness or collapse
• Repeated vomiting or retching, particularly in a pet that has been outdoors
• Suspected snake bite or a tick found on a pet showing any of the above
• A cat that has contacted a recently treated dog and is drooling, twitching or tremoring
• Skin that is raw, weeping, has an odour, or is bleeding from scratching
Getting ready for the season
Most spring problems are cheaper, easier and less distressing to prevent than to treat, and the prevention part is mostly about not letting the calendar get away from you. If your pet is due, our range of APVMA-approved flea, tick and worming products for dogs and cats is available online and delivered to your door, so the routine does not depend on getting to a clinic during opening hours.
Browse flea and tick treatments for dogs, flea, tick and mite treatments for cats, or talk to your vet first if you are unsure what your pet needs this season.
If your pet is managing an ongoing condition, spring is a sensible time to check your repeats are in order before the season gets busy. The allergies and antihistamine range for dogs and the anxiety products for cats are both available online, and what suits your own pet is a question for your vet. If the item you need is a prescription medication.
This article is general information for Australian pet owners and is not veterinary advice. It is not a substitute for a consultation. Always read the label of any veterinary product and follow the directions for use, and speak to your own veterinarian about what is right for your dog or cat.
Sources: Australian Pesticides and Veterinary Medicines Authority, Veterinary Labelling Code, specific labelling requirements for ectoparasiticides for dogs and cats. Australian Veterinary Association, permethrin spot-on flea and tick products. Published research on the distribution and seasonality of Ixodes holocyclus in Australia.
