SYMPTOM
Faecal incontinence
Formed or soft stools are found around the house without the animal appearing to notice or respond, sometimes discovered after the animal has been asleep, rather than following a recognisable toileting sequence.
Age-Related Sphincter Laxity
The anal sphincter, like other muscles, can lose tone with age, particularly in senior dogs and cats, and this alone can allow small amounts of stool to pass without the animal being fully aware, especially during deep sleep when muscle tone is lowest. This pattern is often mild and intermittent rather than constant.
Cognitive Dysfunction Syndrome
In older dogs and cats, disorientation and altered awareness can mean stools are passed in the 'wrong' place even though the sphincter itself is working normally; this is more accurately a change in toileting behaviour than a loss of physical control. It is commonly accompanied by other changes such as altered sleep-wake patterns or apparent confusion in familiar rooms.
Lumbosacral Or Cauda Equina Disease
The nerves controlling the anal sphincter and tail exit the spinal cord low in the back, and compression here, seen more often in older large-breed dogs, can reduce sphincter tone alongside changes in tail carriage or hindlimb strength.
Intervertebral Disc Disease
Disc material pressing on the spinal cord, whether acutely or as a slower degenerative process, can disrupt the nerve pathways to the sphincter; chondrodystrophic breeds such as Dachshunds are recognised as more prone to disc-related presentations.
Degenerative Myelopathy
This slowly progressive spinal cord disease, over-represented in German Shepherds and a number of other medium-to-large breeds, gradually affects the nerves supplying the hindquarters and can eventually involve sphincter control alongside progressive hindlimb weakness.
Local Anal Or Rectal Disease
A mass, chronic anal gland disease, or scarring around the anus can mechanically prevent the sphincter from closing fully, which is a distinct mechanism from a nerve-related loss of control.
Why timing matters
Early observation
An occasional slip during deep sleep, with normal voluntary toileting the rest of the time, often reflects simple age-related muscle relaxation rather than an established underlying disease.
Later presentation
A pattern that becomes more frequent, occurs while the animal is awake and moving around, or is joined by other signs shifts the picture toward an identifiable driver such as a nerve, spinal, or cognitive process.
Because several of the underlying mechanisms (nerve compression, degenerative spinal disease, cognitive change) are themselves gradual processes, the trajectory over weeks to months tends to be more informative than any single incident.
Conditions commonly associated
Degenerative Myelopathy
This progressive spinal cord disease can involve the nerves controlling the anal sphincter as it advances.
Cauda Equina Syndrome
Compression of the nerve roots low in the spine directly affects the pathways controlling sphincter tone.
Intervertebral Disc Disease (IVDD)
Disc material compressing the spinal cord can disrupt the nerve supply to the anal sphincter.
Lumbosacral Stenosis
Narrowing of the spinal canal at the lower back can compress the same nerve roots responsible for sphincter control.
Canine Cognitive Dysfunction
Disorientation associated with cognitive decline can present as apparently unnoticed defecation even when sphincter function is intact.
Anal Gland Disease
Chronic disease or swelling around the anal glands can mechanically interfere with full sphincter closure.
Anal Sac Adenocarcinoma
A mass arising from the anal sac tissue can physically disrupt normal sphincter closure.
When to explore further
A change in tail carriage, hindlimb weakness, or a wobbly gait alongside the incontinence may point toward a spinal or nerve-related contribution.
Urinary leakage occurring alongside the faecal incontinence broadens the picture toward a shared nerve pathway rather than a purely local issue.
A visible or palpable swelling near the anus is worth characterising separately from a nerve-related cause.
Incontinence appearing alongside disorientation, changed sleep patterns, or getting stuck in corners fits more with a cognitive pattern than a physical sphincter problem.
A pattern that is becoming more frequent or is now occurring during waking hours, rather than only during sleep, suggests the underlying driver is progressing.
Keeping a simple log of when accidents happen (asleep, just woken, mid-walk) and how often helps characterise the pattern over time. A short video of the animal walking, including from behind, can capture subtle changes in tail carriage or hindlimb placement. Photographing the area around the anus can document any swelling, and noting any parallel change in urinary control, sleep pattern, or general orientation in the house rounds out the picture.