Hypothermia is a medical emergency that occurs when your body loses heat faster than it can produce heat, causing a dangerously low body temperature. Normal body temperature for a dog is around 100.5-102.5°F or 38-39.2°C Hypothermia occurs when a dogs body temperature falls below 98˚F or 99˚F (37°C).

When the body temperature drops, the heart, nervous system and other organs can't work normally. Left untreated, hypothermia can lead to complete failure of the heart and respiratory system and eventually to death.

Hypothermia is often caused by exposure to cold weather or immersion in cold water. Primary treatments for hypothermia are methods to warm the body back to a normal temperature.

Initially, a dog’s body responds to hypothermia by narrowing blood vessels near the surface to send blood away from the skin, legs, ears, feet, etc., and towards essential organs like the brain and the heart. 

Signs/symptoms of mild to moderate hypothermia in dogs include:

• Excessive shivering

• Muscle stiffness

• Lethargy

• Difficulty walking

• Pale gums

• Cool body surfaces

• Confusion

As hypothermia worsens, dogs will:

• Stop shivering

• Collapse

• Have fixed and dilated pupils

• Develop slow and irregular heart and breathing rates

• Become comatose

• Potentially die

Mild Hypothermia

At this point, you may notice that a hypothermic dog’s extremities (ears, legs, feet, paws) appear somewhat pale and feel cool to the touch. While this physiological response can certainly help a dog survive, it does increase the risk that they’ll suffer from frostbite as time goes on.

Look for:

• Cold areas of the body, especially the extremities (ears, legs, feet, paws)

Moderate Hypothermia

To generate extra heat, a dog with mild to moderate hypothermia will shiver, and their muscles will become tense. This muscular activity produces warmth, but it can also make a dog’s movements stiff and clumsy.

At this point, a hypothermic dog may become sluggish and seem confused.

Look for:

• Shivering

• Stiff or clumsy movements; difficulty walking

• Sluggishness

• Seeming confused

• Pale gums

Severe Hypothermia

As severe hypothermia sets in, a dog will stop shivering because their muscle cells have run out of energy.

Once shivering stops, the dog’s body temperature may begin to rapidly drop.

The chemical reactions that are necessary for normal body functioning in a dog will slow down or stop altogether. The dog’s heart rate slows and becomes erratic, and their breathing slows. As oxygen levels drop in the bloodstream, the dog will become increasingly lethargic and unresponsive.

Eventually shock, organ failure, coma, and death will follow.

Look for:

• Shivering that has stopped

• Rapid drop in body temperature

• Slower breathing

• Collapsing

• Lethargic and/or unresponsive

• Fixed and dilated pupils

Treatment for Dog Hypothermia