Understanding Seasonal Health Risks for Pets

Seasonal change quietly rewrites the pressures on a pet's body across the year. Heat that can't be shed fast enough, cold that steals warmth without much fuss, and bursts of parasites, pollen, mould and toxins all arrive on the back of weather and plant growth. The risk is not spread evenly through the year; it shifts with the seasons, and so should the way you manage it. The good news is that the hazards are well understood and most are easy to plan around once you know what belongs to which season. This page keeps it simple: the main seasonal hazards in Australia, the early signs, and the checks that matter most. ^{1, 2}

How seasonal change affects pets

Pets are not small humans in fur. Many cool themselves mainly by panting, which relies on airflow and hydration rather than sweat. Their paws meet the ground directly, and their noses and skin sit close to grasses, leaf litter and mould. So when the environment changes, their exposure changes with it. ^{1, 2}

Across the year, the most common patterns are:

• Heat and sun (summer, and warm spells in other seasons)
• Parasites (fleas, ticks and mosquitoes depending on region and rainfall)
• Allergens (pollen, grasses, dust, mould)
• Cold exposure and indoor hazards (winter routines, heaters, chemicals)

Spring: allergies and ticks starting early

Spring often brings a noticeable lift in itch and ear problems. Pets can react to pollens and grasses, and to mould stirred up by rain and warmth. The signs usually show on the skin and in the ears rather than as hay fever in the human sense. Common clues include persistent scratching, licking paws, red skin, recurrent ear irritation, and rubbing the face on the carpet. If these start each year around the same time, it is worth a vet chat early, before the skin barrier breaks down and secondary infection sets in.

Spring is also when tick risk climbs. On Australia's east coast, paralysis ticks (Ixodes holocyclus) are a serious seasonal threat. Cases commonly peak from early spring through mid-summer, though risk can extend beyond that depending on local weather and habitat. ^{5, 6} Daily hands-on tick searches still matter even if your pet is on prevention, especially after time in bushy, scrubby or long-grass areas. If you are checking in a hurry, start with the head and neck: a large Australian study found most paralysis ticks on dogs and cats were located on the head, neck or ears. ^{6, 7}

Summer: heat stress, hot surfaces, and hot cars

Heat illness can build quietly, then tip over fast. Panting becomes harder work, hydration slips, and organs begin to struggle. Pets with short muzzles (brachycephalic breeds), thick coats, obesity, heart or airway disease, and the very young or old are at higher risk. ¹ Early signs to treat as urgent include heavy or relentless panting, drooling, weakness or wobbliness, vomiting or diarrhoea, bright red or pale gums, confusion, collapse, or seizures. Seek veterinary help immediately if you suspect heatstroke. ^{1, 2}

Hot ground is the other summer trap. Asphalt, concrete and sand can burn paw pads in full sun. A simple check is the five-second hand test: if you can't hold the back of your hand on the surface for five seconds, it is too hot for your dog's feet. ²

Parked cars are worse. They heat quickly and can become lethal. RSPCA guidance cites research showing that when the outside temperature is 22C, the inside of a car can rise to over 47C within an hour. Cracked windows and shade are not reliable protection. ^{1, 3}

Warm, humid conditions also lift mosquito activity in many regions. Heartworm is spread by mosquitoes and can be fatal, which is why many vets recommend consistent prevention rather than stopping and starting through the year. ⁴

Autumn: damp, mould, and garden hazards

Autumn can be gentle on temperature, but damp weather and leaf litter change what pets sniff, lick and chew. Two issues come up most often. Mould and environmental irritation build in wet, poorly ventilated spaces and often show up as skin and ear flare-ups. Garden foraging is the other, where mushrooms and decomposing plant material can be eaten before you notice.

If your pet is the sort to sample the garden, autumn is a good time to tighten supervision on walks, keep lawns trimmed, and clear leaf piles where small hazards hide.

Winter: cold exposure, chemicals, and routine changes

Cold affects pets unevenly. Short-coated, small, very young, very old, and unwell animals lose heat faster. Provide dry bedding off the ground, shelter from wind and rain, and keep an eye on the pets that seem to cope quietly. Antifreeze products containing ethylene glycol are the season's hidden danger and can be deadly even in small amounts. Clean spills immediately and store containers securely. If you suspect ingestion, treat it as an emergency and do not wait for symptoms. ^{8, 9}

Winter also shrinks walk time and changes routines, and weight can creep in when activity drops but feeding stays the same. Keep food measured, use puzzle feeders, and build small indoor movement habits such as short training sessions, scent games, or stairs if appropriate, rather than relying on one big outing.

Seasonal prevention that holds up all year

A short seasonal routine covers most of the ground:

• Heat days: shade, airflow, water, and walk early or late; avoid hot surfaces. ²
• Tick season or tick areas: daily tick searches, starting with the head, neck and ears; act fast if you see wobbliness or breathing changes. ^{6, 7}
• Mozzie days: manage standing water and ask your vet about heartworm prevention suited to your region and pet. ⁴
• Cold snaps: dry bedding, wind-proof shelter, and extra supervision for small or short-haired pets.

Most pets benefit from at least an annual health check, with more frequent reviews for puppies and kittens, seniors, and pets with chronic skin, heart or airway issues. Parasite prevention and vaccination schedules should match your pet's life (indoor or outdoor, travel, local tick and mosquito risk) rather than the calendar alone. ⁷

When to treat it as urgent

Seek urgent veterinary care if you notice any of the following, especially during hot weather or tick season:

• Collapse, severe weakness, seizures, or marked confusion ¹
• Laboured breathing, noisy breathing, or a sudden change in bark or meow ^{1, 10}
• Wobbliness or hind-limb weakness, since tick paralysis can start subtly ^{5, 10}
• Suspected antifreeze exposure, where you should not wait for symptoms ^{8, 9}

References

1. RSPCA Pet Insurance (Australia) · Heatstroke (hyperthermia) guide for cats and dogs
2. RSPCA NSW · Heat stress (hot weather safety and first aid)
3. RSPCA Australia · Five ways to keep your pet cool this summer (hot cars and summer precautions)
4. ABC News · Protecting dogs and cats from mosquitoes and heartworm (includes RSPCA Qld veterinary advice)
5. NSW Government · Ticks and livestock (seasonality and clinical signs of tick paralysis)
6. The University of Queensland · Paralysis ticks prefer heads and necks of pets (research summary)
7. RSPCA Knowledgebase · How can I protect my dog or cat from tick paralysis?
8. RSPCA Knowledgebase · Common household dangers for pets (includes antifreeze/ethylene glycol)
9. American College of Veterinary Pharmacists · Ethylene glycol (pet poison control information)
10. RSPCA Queensland · Tick warning: protect your pets (signs of paralysis tick and urgency)