Brief version of what to know between September and February: antifreeze (sweet, lethal, often spilled in driveways), fallen acorns and conkers (toxic and choking risk), rock salt on paved areas (irritant and toxic if licked), dark mornings on roads, frozen water (drowning risk under ice), and Christmas-specific food risks. Most are easily avoided once you know they exist.
Winter walking in the UK has a different set of risks than summer. Here's what to watch out for, and the small adjustments that make autumn–winter walks safer.
1. Antifreeze
The single most dangerous winter hazard for dogs in the UK.
When: October–March, particularly during cold snaps when people top up cars, drain radiators, or have spillages.
Where: Driveways, garages, car parks, kerbsides, and increasingly garden ponds where it's used as a "frost protection" (it shouldn't be).
The risk: Ethylene glycol, the active ingredient in most antifreeze and screen wash, tastes sweet to dogs (and cats). They'll lick spills off driveways or out of bowls left for cars. Even a few teaspoons can be fatal to a medium-sized dog.
The damage is to the kidneys, and it happens fast. Without treatment within hours of ingestion, antifreeze poisoning is usually fatal.
Prevention:
- Don't let your dog drink from puddles in driveways or near cars in winter
- Mop up any spills immediately (don't just hose into the road, that creates a sweet puddle)
- Buy the propylene-glycol versions of antifreeze and screen wash where possible (less toxic, though still not safe)
- Be vigilant in rented car parks and shared driveways
Symptoms:
- Initially: drunk-looking, wobbly, unsteady, vomiting (within a few hours)
- Apparent recovery (12–24 hours)
- Sudden kidney failure (24–72 hours)
If you suspect exposure: Vet immediately, even if your dog seems fine. There's a treatment that works if given within hours; later, it doesn't.
This is the hazard that's worth obsessing about. UK dogs die from antifreeze every winter.
2. Acorns and conkers
When: September to November.
Where: Under oak and horse chestnut trees in parks, woodlands, gardens, and avenues.
The risk: Both contain compounds toxic to dogs:
- Acorns — contain tannins, which cause vomiting, diarrhoea, lethargy, and (in larger amounts) kidney damage
- Conkers — contain aesculin, which causes vomiting, gut irritation, and in some cases collapse
Both are also choking hazards and can cause gut blockage if swallowed whole.
Prevention:
- Don't let your dog eat or carry acorns / conkers, most dogs aren't strongly attracted to them but some develop a habit
- Avoid letting them play with conkers as toys; they're a choking risk
- If you walk under chestnut or oak trees, a quick poo-pickup-style scan in season is worth it
If your dog eats one: A single conker or acorn from a small dog is potentially significant, call your vet for advice. Multiple, vet visit.
3. Rock salt and grit
When: December–February (any time UK roads are gritted).
Where: Pavements, driveways, car parks, roads.
The risk: Rock salt, sodium chloride, used to grit roads, is irritating to paws and toxic if licked off in significant quantities.
- Causes paw irritation, drying, and cracking
- Can cause stomach upset, vomiting, increased thirst when ingested in moderate amounts
- High amounts cause salt toxicity (rare but serious)
Some commercial de-icers contain calcium chloride or magnesium chloride, which can be more irritating to paws.
Prevention:
- After any walk on gritted surfaces, wipe paws with warm water at the door
- For dogs that walk on heavily gritted roads daily, paw balm or boots help
- Don't let your dog drink from puddles in winter, they often contain road salt and other contaminants
If a paw is sore or your dog is licking obsessively: check between the toes for grit lodged in fur. A warm-water rinse is usually all that's needed.
4. Frozen ponds, lakes and rivers
When: December–February, especially during prolonged cold snaps.
Where: Any natural still water that freezes, plus reservoirs, canals (where ice forms more easily because the water is shallower), and even garden ponds.
The risk: Two things, the dog falls through, or the dog goes too far and you go in after them.
UK dogs (and their owners) die in frozen water every winter. The combination of unstable ice, cold-water shock, and the difficulty of getting out makes this one of the more lethal winter scenarios.
Prevention:
- Keep dogs on lead near frozen water, including canals.
- Don't throw balls or toys onto ice
- Don't walk across frozen ponds yourself, UK ice is very rarely thick enough to be safe
- If you're walking in cold weather near water, a long-line gives you control without restricting movement
If your dog falls in:
- Don't go in after them. Most cold-water deaths in the UK every year are people trying to rescue dogs.
- Call them from the bank, most dogs find their way out
- Call the fire service (999) if they can't
- Once out, get them dry, warm, and to a vet if hypothermia is suspected
5. Dark-morning road hazards
When: October–March (clocks go back end of October).
Where: Anywhere you walk on or near roads.
The risk: UK winter mornings are dark until 7:30–8am and dark again from 4:30pm onwards. Drivers are sleepy, visibility is poor, and your dog (and you) are essentially invisible without lighting.
Prevention:
- High-vis on you and on the dog. Reflective harnesses, light-up collars, hi-vis vests for you. Cheap and effective.
- A clip-on LED light on the harness or collar
- Avoid walking on or near busy roads after dark
- Lead-walks only along roads in winter, even a "great recall" dog can be missed by a tired driver
- Stick to lit streets, parks with lighting, or places you can use a torch
6. Christmas food
The single highest-volume vet emergency season in the UK is the week between Christmas Eve and 2nd January.
The biggest culprits in UK households:
- Mince pies, Christmas cake, Christmas pudding (raisins / sultanas / currants)
- Selection boxes and chocolate gifts (often left under the tree at dog height)
- Sugar-free chewing gum, mints (xylitol, very fatal)
- Onion-and-sage stuffing (Allium toxicity)
- Cooked turkey carcass / lamb bones (splinter, perforation)
- Fatty turkey skin and gravy (pancreatitis trigger)
- Wine, beer, sherry, advocaat (alcohol)
- Cocoa-dusted truffles, posh hot chocolate (concentrated theobromine)
We've got a full UK food safety guide here. Brief everyone in the house at Christmas, visiting relatives are usually the source of the problem.
7. Mushrooms (autumn)
When: September–November, particularly after rain.
Where: Woodlands, parks, lawns, fields.
The risk: Many UK mushrooms are toxic to dogs. The most dangerous (Amanita species) are autumn-fruiting and look unremarkable. A few mouthfuls can cause liver failure.
Prevention:
- Watch for mushrooms on lawns and woodland walks in autumn
- Discourage your dog from picking them up
- If they do, photograph the mushroom, take a sample if possible, vet immediately
8. Lungworm
When: Year-round, but most owners notice it more in autumn / winter when slug and snail populations are high in damp conditions.
Where: Anywhere with slugs and snails, gardens, parks, woodland.
The risk: Lungworm (Angiostrongylus vasorum) is transmitted via slugs and snails. Dogs ingest the parasite by eating slugs/snails directly, eating grass with slime trails on it, or drinking from outdoor water bowls.
It causes coughing, breathing difficulties, bleeding problems, and can be fatal.
Prevention:
- Many spot-on / oral parasite treatments cover lungworm, check yours does (some don't)
- Don't leave outdoor water bowls overnight
- Discourage slug/snail eating
- Wash toys left in gardens
9. Heatstroke (yes, in winter, in cars)
A small but real risk: dogs can still overheat in cars in winter, particularly in heated cars or sunny windows.
Prevention: Don't leave dogs in cars long enough for it to matter, same rules as summer.
10. Bonfire night and fireworks
When: Late October to mid-November (and New Year's Eve).
Where: Everywhere.
The risk: Not a physical hazard but a behavioural / welfare one. Many UK dogs are very stressed by fireworks.
Prevention:
- Walk before dusk in firework season
- Close curtains, play music or TV to mask sounds
- Don't leave them alone if they're seriously distressed
- Talk to your vet about medication for dogs with serious noise phobia, there are real options (Sileo, Adaptil, others) and they're worth trying before the season, not on the night
- A "safe place" (crate, cupboard, behind sofa) often helps
This is its own topic and worth planning ahead for if your dog is firework-phobic.
A practical autumn-winter walking bag
What to add to your usual kit between September and March:
- High-vis / light-up gear for both of you
- A clean towel for the boot
- A second towel for the dog
- Paw wipes (or a small water bottle for paws)
- A spare lead in case the main one snaps in cold (biothane handles cold better than nylon)
- Treats in a closed pouch (cold pockets get gross)
- Your vet's number saved on your phone
A general rule for winter walks
Same as the summer guide: if you're not sure something's safe, water, ice, terrain, assume it's not, and walk somewhere else. There's almost always a clearly safe alternative.
Also worth saying: skipping a walk because the weather's bad is fine. A bored dog is a much smaller problem than a hypothermic, salt-injured, or hit-by-a-car dog.
FAQs
My dog ate a conker, how worried should I be? A single conker from a medium-large dog is unlikely to cause serious illness, but call your vet. Multiple conkers, or any from a small dog, vet visit recommended.
How do I know if my dog has antifreeze poisoning? Initial signs are wobbliness, drunken behaviour, vomiting. If you suspect any antifreeze contact, vet immediately, don't wait for symptoms.
Can dogs walk in snow safely? Yes for short walks, but watch for ice-balls between toes (especially long-coated breeds), salt on paws, and slipping on hard-packed snow. Boots help some dogs; others hate them.
What's the best paw balm for winter? Most pet-shop paw balms (Mushers Secret, Paw Pomade, etc.) work fine. The brand matters less than using one.
Are dog fields usable in winter? The good ones, yes, particularly fields with installed drainage or astroturf areas. Many close after heavy rain or hard frost. Check the listing and recent reviews.
Should I cut walks short in winter? Match the conditions. Below 5°C is fine for most dogs. Below freezing with wind or wet, shorter walks. Below -5°C, very short walks for short-coated and small breeds; coats help.