Moderate severity
Constipation
Infrequent, difficult, or painful passing of hard, dry stools. Common in middle-aged and senior cats and, if ignored, can progress to serious obstruction.
⚠️ Common symptoms
Constipation means stool moving through the colon too slowly, so that too much water is reabsorbed and the faeces become hard, dry and difficult to pass. It is one of the more common digestive complaints in cats, particularly from middle age onwards.
Water is at the heart of the problem. Cats evolved from desert ancestors and have a naturally low thirst drive, so many live in a state of mild chronic dehydration — especially those fed only dry food. A drier colon means drier stool. This is why the single most effective change for most constipated cats is simply getting more moisture into them, through wet food and tempting water sources.
Pain and mobility play a bigger role than many owners realise. An arthritic senior cat may find it genuinely uncomfortable to climb into a high-sided tray and adopt the squatting posture, so it 'holds on', and the longer stool sits in the colon the harder it becomes — a vicious cycle. Providing a large, low-sided tray on each floor of the home can make a surprising difference.
Constipation should never be left to drift. Repeated or prolonged episodes can stretch the muscular wall of the colon until it loses its ability to contract — a condition called megacolon that is far harder to manage. Early attention to hydration, fibre and any underlying pain keeps the vast majority of cats regular and comfortable. And because a straining cat can equally be suffering a blocked bladder — a true emergency — any cat that appears 'stuck' in the tray deserves a same-day veterinary check.
🔍 Causes
The commonest cause is simple dehydration, which lets the colon draw too much water from the stool. Other triggers include low-fibre diets, hairballs, insufficient exercise, painful conditions (arthritis or anal-gland problems) that make toileting uncomfortable, litter-tray aversion, and underlying diseases such as chronic kidney disease. Long-standing constipation can stretch and weaken the colon, leading to megacolon.
🛡 Prevention
Keep your cat well hydrated by feeding wet food and providing appealing water sources, maintain a healthy weight and regular activity, groom long-haired cats to reduce hairball load, and keep litter trays clean, numerous and easy to reach — especially for arthritic seniors. Address any pain that might make squatting uncomfortable.
💊 Treatment
Mild cases respond to improved hydration (wet food and water fountains), added dietary fibre or a vet-recommended fibre supplement, and laxatives such as lactulose prescribed by your vet. Increasing exercise and ensuring a clean, accessible litter tray help. More severe impaction may need veterinary treatment with fluids and a professionally administered enema — never give a cat an over-the-counter human (phosphate) enema, which can be fatal.
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⚕️ Medical disclaimer
- This information is educational only and is not a substitute for veterinary advice.
- Symptoms overlap between conditions — only a vet can diagnose accurately.
- Never withhold treatment or self-medicate based on information found online.
- When in doubt, call your vet. Early intervention almost always leads to better outcomes.