SYMPTOM
Muscle stiffness
Owners may see a dog that is slow or reluctant to get up, walks with short, stilted steps, holds the back or neck rigid, or stands with the legs braced. The stiffness may be most obvious after rest, after exercise, or in episodes, and it may come with trembling, twitching, panting or signs of pain.
Degenerative Joint Disease (Osteoarthritis)
In dogs, joint degeneration most often develops from developmental joint problems such as hip or elbow dysplasia, and less often from injury, infection or immune-mediated disease. Inflammation and thickening around the affected joints cause stiffness that is typically most obvious after rest, with slowness to rise and difficulty on stairs. Changes can start in young dogs, but signs are usually first noticed between about 5 and 13 years of age.
Spinal Cord and Nerve Root Disease
Intervertebral disc disease often starts with back or neck pain, seen as a hunched, rigid back or stiff neck and reluctance to move. It can progress to a wobbly hind end, then loss of hind-leg movement, usually with loss of the ability to pass urine. Chondrodystrophic breeds such as Dachshunds, French Bulldogs and Beagles are most often affected, from as young as 1 to 2 years of age. Degenerative myelopathy is a separate, slowly progressive and non-painful spinal cord disease that causes wobbliness and weakness of the hind legs, usually in dogs over 8 years old, most often German Shepherd Dogs, Pembroke Welsh Corgis and Boxers.
Endocrine Myopathy (Hypothyroidism)
Low thyroid hormone can occasionally cause a muscle disorder (hypothyroid myopathy), with general stiffness, weakness, diffuse muscle pain and muscle wasting. Nerve and muscle signs are uncommon compared with weight gain, lethargy and coat changes. Hypothyroidism is most common in mid to large breed dogs aged 4 to 10 years, and Golden Retrievers and Dobermanns are among the breeds more often affected.
Inherited Paroxysmal Movement Disorder
Certain breeds, most notably the Cavalier King Charles Spaniel, carry an inherited tendency towards episodes of sudden increased muscle tone and stiffness in the hind or all four limbs, usually triggered by excitement or exercise. Episodes are self-limiting and the dog is normal between them, distinguishing this pattern from progressive joint or neurological disease.
Normal Post-Exertional Stiffness
Unaccustomed or particularly vigorous exercise can leave healthy dogs of any age transiently stiff and reluctant to move over the following day. This settles with rest and gentle activity and is not associated with other signs of illness.
Causes of Rigidity That Can Worsen Quickly
Stiffness that comes on suddenly with trembling, twitching, panting, restlessness or a high temperature can reflect conditions that can worsen quickly. In a bitch nursing puppies, usually 2 to 3 weeks after whelping, low blood calcium (eclampsia) progresses from panting, restlessness and a stiff gait to tremors, rigid muscles, seizures, coma and death. Metaldehyde slug bait causes severe muscle tremors and a body temperature that can exceed 41 to 42°C, starting 30 minutes to 6 hours after eating it, and death can follow within 4 to 24 hours. Tetanus usually appears 10 to 14 days after a wound; in dogs it often starts as stiffness in the wounded limb and can spread to the whole body, with the lips drawn back, and spasm of the breathing muscles can be fatal (about half of affected dogs died in one study). These causes cannot be told apart from milder ones at home.
Why timing matters
Early observation
Sudden stiffness with trembling, twitching, panting or collapse can come from eclampsia or slug bait poisoning, which can progress to seizures within hours. Stiffness that starts in a wounded leg can reflect tetanus, which can spread to the whole body over about a day and affect breathing. Stiffness with back pain and wobbly hind legs can progress to loss of hind-leg movement and bladder control.
Later presentation
Stiffness that builds slowly over weeks or months, and is worst after rest, fits joint disease or slowly progressive conditions, where the pattern over time helps assessment.
The significance of this symptom depends on its context, duration, and associated findings.
Conditions commonly associated
Leptospirosis
Muscle pain, stiffness, weakness, trembling or reluctance to move can occur in leptospirosis, a bacterial infection that can cause acute kidney injury, respiratory disease or death.
Osteoarthritis in Dogs
Muscle stiffness can reflect reluctance to move affected joints in osteoarthritis, where pain and inflammation lead to protective guarding and reduced range of motion. Stiffness is often worse after rest and in cold, damp weather.
Intervertebral Disc Disease in Dogs
Muscle stiffness can accompany intervertebral disc disease when spinal cord compression or nerve irritation causes muscle spasm and altered tone along the back and limbs. The stiffness may reflect protective splinting of the spine or neurological changes affecting muscle control.
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Degenerative Myelopathy in Dogs
Degenerative myelopathy causes a gradual, non-painful wobbliness and weakness of the hind legs, usually in dogs over 8 years old, which can look like a stiff, unsteady hind-leg gait.
Hypothyroidism in Dogs
Hypothyroidism can occasionally cause a muscle disorder with generalised stiffness, weakness and diffuse muscle pain, alongside reduced activity and loss of muscle mass.
Episodic Falling Syndrome
This syndrome causes episodes of sustained muscle contraction that leave the limbs and back rigid for the duration of the episode.
Eclampsia in Dogs
Low blood calcium in a nursing bitch, usually 2 to 3 weeks after whelping, causes panting, restlessness, a stiff gait and muscle tremors that can progress to rigid muscles, seizures and death.
When to explore further
When the symptom is persistent or worsening
When other signs are present alongside
When daily activities or quality of life are affected
When there is uncertainty about the cause
When stiffness comes on suddenly with trembling, twitching, panting, restlessness, collapse or a high temperature, particularly in a bitch nursing puppies or after possible access to slug pellets
When stiffness comes with a hunched back, a stiff neck, wobbly or weak hind legs, or difficulty passing urine
When stiffness starts in a leg with a wound, or spreads from one leg to the body, with the lips drawn back
For stiffness that develops gradually, noting when it occurs, any triggers, and how it changes over time can provide useful information for veterinary discussions.
Last reviewed: 9 October 2026 · Dr Alastair Greenway MRCVS