Cold and pre-existing conditions in dogs and cats –
what are the risks?
For many animals, cold is not just “unpleasant.” Cold and dry air, as well as slight hypothermia, can noticeably worsen certain pre-existing conditions.
Cold inhaled air is the strongest trigger – more dangerous than “cold weather” itself. Heart and especially lung patients are particularly at risk. Seniors, cats with CNI, and asthmatics react early and often dramatically. Subclinical deteriorations in winter, on the other hand, are often overlooked because they progress insidiously.
Table of contents
Respiratory tract – here the risk is highest
Particularly affected are:
- Chronic Bronchitis (more common in dogs)
- Feline asthma
- Tracheal collapse (narrowing/instability of the windpipe in dogs)
- Lung diseases with increased pressure in the pulmonary vessels (pulmonary hypertension)
Why does cold make it worse?
Cold air can constrict the bronchi, making mucus thicker and harder to clear. This makes breathing more difficult.
Possible consequences: more Cough, Dyspnea (labored breathing), and asthma attacks.
Cardiovascular
Particularly affected are:
- Chronic Congestive heart failure (more common in dogs)
- Feline heart muscle diseases (cardiomyopathies)
Why can cold be problematic?
In cold conditions, the body constricts blood vessels in the skin and extremities to conserve heat. This increases blood pressure, and the heart has to work against higher resistance.
Possible consequences: faster fatigue, reduced exercise tolerance, risk of worsening heart disease. Some animals also have an increased risk of fluid accumulation in the lungs.
Musculoskeletal system (joints, spine, muscles)
Particularly affected are:
- Osteoarthritis
- Spondylosis
- and other chronic back/spinal problems
Why can Pain worsen in the cold?
Muscles tense up more easily, and synovial fluid becomes “thicker.” This can make movements stiffer and more painful.
Possible consequences: more Stiffness, Lameness, Pain – especially after rest periods.
Neurological disorders
Particularly affected are:
- Disc problems
- peripheral nerve diseases (e.g., in paws/legs)
Why can cold worsen conditions?
Tense back muscles can intensify Pain. Additionally, nerves react more sensitively to cold.
Possible consequences: stronger Pain, more noticeable gait, possible neurological deterioration.
Kidneys and urinary tract
Particularly affected are:
- Chronic kidney disease (more common in cats)
- Idiopathic Cystitis/FLUTD (cat)
Why is winter critical?
Many animals drink less in the cold. In addition, there is dry heating air. Both promote dehydration, and Stress (e.g., less movement, more indoors) can particularly strain the bladder in cats.
Possible consequences: worsening kidney values, recurrence / relapse of bladder problems.
Hormones and metabolism
Particularly affected are:
- Hypothyroidism in dogs
- Diabetes mellitus in dogs and cats
Why can cold have an influence?
In some diseases, thermoregulation works less effectively. Additionally, energy requirements and Insulin sensitivity can change.
Possible consequences: pronounced Intolerance to cold, more fluctuating blood sugar levels.
Immune system and skin
Particularly at risk are:
- Seniors
- Animals under immunosuppression (e.g., Cortisol, chemotherapy)
- Animals with atopic dermatitis
Why can cold be problematic?
Mucous membranes become drier and less well supplied with blood, and the skin barrier is often weakened in winter.
Possible consequences: higher Susceptibility to infection, more Itching, slower wound healing.
Tabular summary
Cold and pre-existing conditions in dogs and cats – Overview
Organ system | Pre-existing condition | Pet Type | Problem due to cold | Why? (Mechanism) | Typical consequences |
Respiratory tract | Chronic Cough (chronic bronchitis/COPD-like) | Dog > Cat | Cold inhaled air | Bronchi constrict (bronchoconstriction), mucus becomes thicker | More Cough, Dyspnea (labored breathing), exacerbations |
Respiratory tract | Feline asthma (feline asthma) | Cat | Cold, dry air | Bronchi spasm (bronchospasm), Inflammation increases | Asthma attack, Dyspnea (labored breathing) |
Respiratory tract | Unstable/narrow windpipe (tracheal collapse) | Dog | Cold air, urge to Cough | Mucous membrane irritated, windpipe collapses more easily (dynamic collapse) | Coughing fits |
Respiratory tract | High blood pressure in the lungs (pulmonary hypertension) | Dog > Cat | Cold air | Vessels constrict with low oxygen (hypoxic vasoconstriction) | Dyspnea (labored breathing), Syncope |
Heart | Congestive heart failure (chronic heart insufficiency) | Dog > Cat | Cold exposure | Vessels constrict, heart pumps against more resistance (afterload increases) | Acute deterioration (decompensation), fluid in the lungs (pulmonary edema) |
Heart | Heart muscle disease (cardiomyopathy) | Cat | Cold | Blood pressure rises, oxygen demand increases | Rapid exhaustion, reduced exercise tolerance (exercise intolerance) |
Musculoskeletal system | joint degeneration / osteoarthritis (Osteoarthritis) | Dog = Cat | Cold, humidity | Muscles tense up, synovial fluid becomes thicker (synovial fluid) | Lameness, Pain, Stiffness |
Musculoskeletal system | Spinal degeneration (Spondylosis) | Dog | Cold | Muscles tense up, mobility decreases | Pain, Stiffness |
Spine | Disc problem/herniation (disc disease) | Dog > Cat | Hypothermia | Back muscles tense up (paraspinal muscle tension), pressure on nerves can increase | More Pain, possibly deficits (neurological deterioration) |
Neurology | Nerve damage in legs/paws (peripheral neuropathy) | Dog = Cat | Cold | Nerves work slower (nerve conduction velocity decreases) | Unsteady gait (ataxia), weakness |
Niere | Chronic kidney weakness (chronic kidney disease) | Cat > Dog | Slight hypothermia | Kidney perfusion decreases (renal perfusion decreases) | Worse kidney values (azotemia) |
Urinary tract | Cystitis without germs (idiopathic Cystitis/FLUTD) | Cat | Cold + Stress | Often drinks less, urine is more concentrated (urine concentration increases), Stress burdens the bladder | Recurrence / relapse, Pain during urination |
Endocrine | Schilddrüsenunterfunktion (Hypothyreose) | Dog | Cold | Thermoregulation is worse (thermoregulation decreases) | Intolerance to cold, Lethargy |
Endocrine | Diabetes Mellitus | Dog = Cat | Cold, less activity | Insulin works differently (Insulin sensitivity changes) | Fluctuating blood sugar levels |
Skin | Allergic skin/neurodermatitis (atopic dermatitis) | Dog > Cat | Cold, dry air | Skin barrier weakens (skin barrier weakened) | More Itching, exacerbations |
immune system | Weakened immune system (immunosuppression) | Dog = Cat | Cold, dry air, hypothermia | Mucous membranes dry out, immune defense weaker (immune function decreases) | More infections, slower wound healing |