Winter Pet Emergencies: Frostbite, Hypothermia, and Ice Salt Burns

Ontario winters are beautiful — and dangerous. With temperatures in Northern Ontario regularly dropping below -25°C and wind chills pushing -40°C, winter pet emergencies are a serious and common concern. The Ontario SPCA reports a spike in cold-related animal distress calls every year between December and February, with hypothermia and frostbite among the leading causes.

This guide covers the most common winter pet emergencies, how to recognize them, what first aid to give, and when to get to an emergency vet.

---

Hypothermia

Hypothermia occurs when your pet's body temperature drops below 37°C (normal is 38.0–39.2°C). It can happen faster than most people realize — especially in wet conditions, wind, or with small, thin-coated, young, or elderly animals.

Risk Factors

• Small breeds and toy breeds
• Short-haired breeds (Greyhounds, Chihuahuas, Boxers)
• Puppies and kittens (poor temperature regulation)
• Senior pets
• Wet fur (dramatically accelerates heat loss)
• Outdoor cats sheltering in unheated spaces

Stages of Hypothermia

Stage	Body Temperature	Signs
Mild	32–37°C	Shivering, lethargy, cold ears and paws
Moderate	28–32°C	Severe shivering then shivering stops, stiff muscles, slow heart rate, shallow breathing
Severe	Below 28°C	No shivering, unresponsive, very slow/irregular heartbeat, fixed dilated pupils

First Aid for Hypothermia

1. Move indoors immediately — out of wind and cold
2. Wrap in warm blankets — not electric heating pads (risk of burns). Use body heat, warm water bottles wrapped in towels, or microwaved rice socks
3. Warm slowly — rapid rewarming can cause dangerous heart arrhythmias
4. If conscious, offer warm (not hot) water to drink
5. Check body temperature with a rectal thermometer every 10 minutes
6. Get to a vet if temperature doesn't rise above 37°C within 30 minutes, or if your pet is moderate to severely hypothermic

Moderate and severe hypothermia are veterinary emergencies. Internal rewarming with warm IV fluids is needed.

---

Frostbite

Frostbite occurs when tissue freezes, typically at the extremities: ear tips, tail tip, paw pads, and scrotum. It often accompanies hypothermia.

How to Recognize Frostbite

Frostbite isn't always immediately obvious. Signs may take days to fully appear:

• Initial: Skin appears pale, grey, or bluish. Area is cold and hard to the touch.
• After rewarming: Skin turns red, swollen, and painful. Blisters may form.
• Severe: Skin turns black over days to weeks (tissue death/necrosis). Affected tissue may slough off.

First Aid for Frostbite

1. Move indoors
2. Do NOT rub the affected area — rubbing damages frozen tissue further
3. Apply warm (38–40°C) water with compresses or soaking — NOT hot water
4. Do NOT use a hair dryer or heating pad — frostbitten tissue has no sensation and burns easily
5. Do not rewarm if there's a risk of refreezing — freeze-thaw-refreeze causes the worst damage
6. See your vet within 24 hours — frostbitten tissue may need wound management or amputation

---

Ice Salt and Chemical Deicer Burns

Road salt (sodium chloride) and chemical deicers (calcium chloride, magnesium chloride) are everywhere on Ontario roads and sidewalks from November through April.

The Problem

• Salt crystals lodge between paw pads, causing chemical burns, cracking, and bleeding
• Dogs lick their paws, ingesting salt — causing vomiting, diarrhea, and in large amounts, sodium toxicity
• Cats who walk on treated surfaces and groom their paws are also at risk

Prevention

• Wipe paws with a warm, damp cloth after every walk
• Use pet-safe paw balm (mushers wax) before walks to create a barrier
• Dog boots — many dogs resist them, but they're the most effective protection
• Stick to cleared paths and avoid walking through salt piles
• Use pet-safe ice melt on your own property
• Rinse the belly of low-riding breeds (Dachshunds, Corgis, Bassets)

When to See the Vet

• Paws are cracked, bleeding, or blistered
• Your dog is limping or refusing to walk
• Signs of salt ingestion: excessive thirst, vomiting, diarrhea, tremors

---

Antifreeze Poisoning (Winter Peak)

Antifreeze (ethylene glycol) poisoning peaks in Ontario during fall and early winter when vehicles are winterized. It's the deadliest common household poison for pets.

• As little as 1 tablespoon can kill a cat
• 2–3 tablespoons can kill a 10 kg dog
• It tastes sweet — pets will lick spills and puddles

Signs (in order of appearance)

1. 30 min – 12 hours: Appearing drunk — stumbling, vomiting, excessive thirst and urination
2. 12–24 hours: Seeming to "improve" (deceptively)
3. 24–72 hours: Kidney failure — vomiting, no appetite, no urination, seizures, coma

What to Do

This is a race against time. Treatment must begin within:

• 8–12 hours for dogs
• 3 hours for cats

The antidote (fomepizole or ethanol) is only effective before kidney damage occurs. If you suspect antifreeze exposure, get to an emergency vet immediately — don't wait for symptoms.

See our full guide: Pet Poison Control Guide for Canadian Pet Owners

---

Carbon Monoxide Poisoning

A winter-specific risk that's often overlooked: carbon monoxide (CO) from vehicles warming up in attached garages, malfunctioning furnaces, or generators.

Pets are smaller and breathe faster, so they're affected before humans.

Signs:

• Lethargy, weakness
• Difficulty breathing
• Bright cherry-red gums (classic but not always present)
• Vomiting
• Collapse, seizures

What to do: Move to fresh air immediately. Get to an emergency vet — oxygen therapy is needed.

---

Winter Safety Checklist

• Limit time outdoors when wind chill is below -20°C — even for cold-adapted breeds
• Never leave pets in an unheated car — cars act as refrigerators in winter
• Provide shelter for outdoor cats — insulated shelters with straw (not blankets, which retain moisture)
• Bang on the hood before starting your car — outdoor cats sleep on warm engines
• Clean up antifreeze spills immediately — switch to pet-safe propylene glycol antifreeze
• Wipe paws after every walk
• Check paw pads regularly for cracking, bleeding, or irritation
• Keep your pet visible — winter has limited daylight. Use reflective collars or LED clip-on lights
• Keep PetEmergency bookmarked — petemergency.ca/triage for 24/7 triage access

---

Emergency Vet Access in Northern Ontario

Winter emergencies often happen at the worst possible time — late at night, in a storm, far from the city. Start a triage on PetEmergency.ca to find who's on call right now.

• Emergency vet in North Bay
• Emergency vet in Sudbury
• Emergency vet in Huntsville
• Emergency vet in Parry Sound
• Emergency vet in Mattawa

---