Signs your cat may have worms — and what to do about it

Quick answer. The five most common signs of worms in cats are: (1) visible rice-grain-sized white segments around the rear, on bedding, or in stool (tapeworm — almost always Dipylidium, the flea tapeworm); (2) eating more than usual but losing weight; (3) a dull, ungroomed coat in a normally tidy cat; (4) scooting along the floor or excessive licking under the tail; (5) a bloated belly disproportionate to the cat’s frame, especially in kittens. Most uncomplicated cases are treatable at home with a praziquantel + pyrantel embonate tablet (Biheldon, Drontal Cat). Call the vet first if the cat is under 6 weeks old, lethargic, vomiting persistently, off food, has blood in stool, or shows breathing difficulty (lungworm — a separate condition).

Cats are good at hiding illness. By the time worm symptoms become visible, the infection has usually been going on for weeks or months. This guide covers what to watch for, what counts as a vet emergency rather than a self-treat situation, and how to fold treatment into the normal household routine.

The five most common signs

1. Visible worm segments in stool, around the rear, or on bedding

The single most common observation that prompts UK cat owners to search for worm information is rice-grain-sized white pieces found around the cat’s rear, on bedding, in fresh stool, or where the cat normally sits. These are tapeworm segments.

In UK pet cats, the dominant tapeworm is Dipylidium caninum — the flea tapeworm. Segments are typically 2–5 mm long, flat, off-white or cream-coloured, and sometimes visibly moving (fresh) or dried out and sesame-seed-like (a few hours old).

What it usually means: the cat has had fleas recently — even if you haven’t seen the fleas themselves. Dipylidium caninum completes its lifecycle inside the flea, and the cat acquires it by grooming and accidentally swallowing an infected flea. Tapeworm segments visible today means a flea was swallowed weeks ago.

What to do: worm the cat with a praziquantel-containing product (Biheldon, Drontal Cat, Milbemax Cat), AND start or restart consistent flea control. Without addressing the fleas, the cat will re-acquire tapeworm within weeks.

A less common UK tapeworm in cats is Taenia taeniaeformis — acquired by eating prey (mice, voles). Segments are slightly larger and rectangular. Same treatment.

2. Eating more than usual but losing weight

A cat with a meaningful intestinal worm burden often eats normally or even more than usual while losing condition — the worms are taking the nutrient absorption. This is a classic Toxocara cati (roundworm) pattern in particular, because adult roundworms feed on the gut contents and produce eggs at the rate of millions per day from a moderate burden.

What it usually means: an active worm burden, often Toxocara cati but possibly mixed with hookworm. UK adult outdoor cats have around 26% prevalence of patent T. cati infection at any time per the Wright 2016 UK study.

What to do: worm the cat with a broad-spectrum product. If the weight loss is significant, has been ongoing for weeks, or comes with any other symptom, talk to a vet first — there are non-parasitic causes of weight loss in cats (hyperthyroidism, kidney disease, diabetes) that can present similarly and need ruling out.

3. A dull, ungroomed coat in a normally tidy cat

Cats with significant worm burdens often stop grooming as well — partly because they feel mildly unwell, partly because the malnutrition from the parasite load shows up in coat condition first.

The change is gradual and easy to miss in your own cat. A useful test: compare current photos with photos from 6 months ago. A coat that has gone from glossy to dull or from soft to slightly stiff and stuck-together is a real signal.

What it usually means: chronic intestinal worm burden, often with other subtle signs you may not have noticed (slight weight loss, slightly reduced grooming time).

What to do: worm and observe over the following 2–4 weeks. Coat condition usually improves visibly as the cat regains nutritional efficiency.

4. Scooting along the floor or excessive licking under the tail

A cat dragging their rear along the floor or persistently licking under the tail is responding to local irritation — usually tapeworm segments around the anus, occasionally hookworm-associated irritation, sometimes anal gland issues unrelated to worms.

What it usually means: tapeworm in roughly 80% of UK cat cases (Dipylidium if there’s been flea exposure; Taenia if the cat hunts). Less commonly, an anal gland issue that needs vet attention.

What to do: check the rear and surrounding fur for tapeworm segments. If you find them, worm with a praziquantel-containing product. If you don’t find any segments but the scooting continues, see a vet — anal gland issues are easily diagnosed and treated but won’t resolve with a wormer.

5. A bloated or pot-bellied belly

A disproportionately bloated belly — particularly in kittens and young cats — is the most visually striking worm symptom and the one most owners immediately associate with worms. It usually indicates a heavy Toxocara cati roundworm burden.

What it usually means: a clinically significant Toxocara burden, almost universal in unwormed kittens. Less common in adults but possible in cats with no worming history or recent rescues.

What to do for kittens: if the kitten is under 6 weeks of age, see a vet first — dosing very young kittens is sensitive. For kittens 6+ weeks (at minimum body weight ~700 g), use Biheldon (¼ tablet) or another tablet wormer per the kitten worming schedule.

For adult cats with a sudden pot-belly: this is less likely to be worms and more likely to be a vet issue (effusion, organomegaly, urinary obstruction). See a vet first rather than worming empirically.

Less obvious signs to watch for

Beyond the five above, some less-specific signs that can indicate worms:

• Vomiting — particularly with visible worms in the vomit (pale, spaghetti-like Toxocara cati adults). Vomiting alone isn’t worm-specific.
• Loose stools with mucus — hookworm or heavy roundworm burden can produce this
• Blood in stool — heavy hookworm burden (cats with significant Ancylostoma burden) can produce dark, tarry stools
• A persistently grumpy or withdrawn cat — chronic low-grade discomfort from a parasite burden affects mood

These can have many other causes. Worm-treat empirically only if other signs from the main list are also present; otherwise see a vet for diagnosis.

What’s NOT a sign of worms (despite the search results)

A few symptoms commonly attributed to worms that usually mean something else:

• Persistent coughing in cats. Aelurostrongylus abstrusus (feline lungworm) is rare in UK pet cats; most cat-cough cases are asthma, feline herpesvirus, or other respiratory issues. See a vet.
• Itchy skin or hair loss — almost always fleas, allergies, or skin conditions. Not intestinal worms.
• Bad breath alone — dental disease in cats is far more common than worm-associated halitosis.
• A picky eater — usually behaviour or dental issues, not worms.

When to see the vet rather than treating at home

Worm yourself when:

• The cat is otherwise well, eating, drinking, and behaving normally
• One or more of the five main signs is present
• The cat is at least 6 weeks old and above minimum dosing weight (~700 g for tablet wormers)
• There is no obvious other illness alongside the symptom

See a vet first when:

• The cat is under 6 weeks old or otherwise tiny — vet-led dosing
• Persistent vomiting beyond a single episode
• Lethargy lasting more than a day
• Off food entirely — refusing food more than 24 hours
• Blood in stool beyond a single streak, or black tarry stools
• Breathing difficulty or persistent cough — lungworm signs, urgent
• Sudden weight loss with normal eating in an older cat — may be hyperthyroidism or kidney disease, not worms
• Multiple symptoms simultaneously — multiple symptoms usually indicate something more complex than a routine worm burden

What to actually use to treat

For most UK cats with confirmed worm signs, the right product is a praziquantel + pyrantel embonate combination tablet:

• Biheldon — £0.50/tablet; cats typically take ½ tablet (small cats) or 1 tablet (5–10 kg cats)
• Drontal Cat — £2.51/tablet; same active ingredients, NFA-VPS
• Milbemax Cat — POM-V, used where lungworm cover is also wanted (rare in UK cats)

For cats who refuse tablets, the spot-on alternatives:

• Dronspot — emodepside + praziquantel, NFA-VPS, no prescription needed
• Profender — same actives, POM-V

For confirmed whipworm or Giardia in cats (uncommon), Panacur (fenbendazole) is the right product — but cats with these conditions usually need vet diagnosis first via faecal egg count.

Preventing reinfection

Treating the cat is half the job. The other half is the environment and the household:

• Pick up faeces promptly in the litter tray and around the garden
• Wash bedding hot if you’ve seen tapeworm segments — eggs can persist
• Treat all cats in the household on the same schedule — one untreated cat reinfects the others
• Keep fleas controlled — most UK cat tapeworm is fleas-driven; consistent flea control prevents recurrence
• Run a follow-up faecal egg count 2 weeks after dosing if you want to confirm clearance — see the worm count vs blanket worming guide for UK testing options

After treatment — what to expect

In the 24–48 hours after a praziquantel + pyrantel tablet, you may see:

• Dead worms or tapeworm segments in the stool — this is the treatment working, not a problem
• Slightly softer stools for 12–24 hours — the gut clearing a parasite load
• A normally tidy cat returning to better coat condition over 1–2 weeks
• No visible worms in stool at all if the pre-treatment burden was low — also normal

If symptoms persist beyond 1–2 weeks after dosing, or if new symptoms appear (vomiting, off food, breathing changes), see a vet — there may be something else going on.

The bottom line

The most common signs of worms in cats are visible tapeworm segments (almost always Dipylidium from flea exposure), weight loss with normal eating, dull coat, scooting, and pot-belly in kittens. Most cases are treatable at home with a praziquantel + pyrantel embonate tablet like Biheldon. See a vet first for very young kittens, persistent vomiting, blood in stool, breathing difficulty, or any combination of symptoms that suggests something more complex.

Worming a cat with visible signs is one job; preventing recurrence is the other half — consistent flea control and a regular 3-monthly worming schedule for the household will keep most cats clear most of the time.

See Biheldon’s dosing chart for cats, the worm identification guide for visual references for each parasite type, and the pillar guide on how often to worm a cat for the routine schedule.

Tags: #cats#symptoms#identification