By Dial A Vet Veterinary Team
Search online for pumpkin seeds and cats and you will find claims that they clear worms, fix hairballs and cure constipation. None of these hold up well, and believing them can delay care a cat actually needs. Pumpkin seeds are not toxic to cats, and a plain ground pinch now and then is unlikely to cause harm. The bigger risks come from whole seeds, flavoured seeds and from using seeds in place of proper veterinary care.
Key takeaways
- Pumpkin seeds are not toxic to cats, but they are not a treatment for anything.
- Whole seeds and shells can cause vomiting or, rarely, a blockage in a small cat.
- Salted, tamari, garlic or spiced pepitas are unsuitable for cats.
- Pumpkin seeds are not a reliable dewormer. Cats need registered parasite products.
- Straining in the litter tray can be a urinary blockage, which is an emergency.
- Related: how to prepare pumpkin seeds for cats, garlic and cats, diarrhoea in cats.
Myth one: pumpkin seeds deworm cats
Pumpkin seeds contain cucurbitin, and a handful of laboratory and rodent studies suggest it can affect certain parasites. That has not been shown to reliably clear worms in cats, and there is no known safe, effective home amount. Meanwhile, a cat with a real worm burden keeps carrying it, and some worms can spread to people, particularly children. Cats in Australia should be on a parasite plan your vet recommends, which may cover roundworm, hookworm, tapeworm, fleas and heartworm depending on lifestyle.
Myth two: pumpkin seeds fix hairballs
Hairballs come from swallowed fur during grooming. Frequent hairballs can be a sign of over-grooming from itch or stress, or of a gut that is not moving normally. Seeds do not address either. Regular brushing, an appropriate diet and a vet check if hairballs happen more than occasionally are more useful.
Myth three: seeds are a natural laxative
Plain pumpkin flesh is sometimes suggested by vets for mild stool issues. Seeds are a different food: dense, fatty and harder to digest. More importantly, constipation in cats is often a sign of something else, such as dehydration, kidney disease, arthritis that makes squatting painful, or a stretched colon (megacolon). Treating it with seeds at home can let those problems progress.
The real risks
Whole seeds and shells
Cats chew with scissor-like teeth and tend to swallow small items whole. Pumpkin shells are flat and fibrous. A few may be vomited up. A larger number can irritate the stomach and, rarely, contribute to a blockage, especially in kittens.
Flavoured pepitas
Snack pepitas are often roasted in tamari or soy, salt, garlic, chilli or sweet spice blends. Cats are especially sensitive to garlic and onion, which damage red blood cells and can cause anaemia that shows up days later. Salt-heavy seeds can cause vomiting and thirst.
Fat and weight
Pumpkin seeds are close to half fat. Regular handfuls add calories quickly for an animal that may need only a couple of hundred calories a day, and fatty food can trigger vomiting or diarrhoea.
Warning signs to act on
Call your vet if your cat:
- Vomits more than once after eating seeds
- Goes off its food for more than a day
- Has diarrhoea lasting more than a day or two
- Has pale gums, fast breathing or seems weak after eating seasoned seeds
- Has repeated hairballs or ongoing constipation (whatever you have tried)
When it is an emergency
A cat, especially a male cat, that is straining in the litter tray and producing little or no urine may have a urinary blockage. This can become life-threatening within hours. Owners often mistake it for constipation. Go to a vet immediately. Also seek urgent care for repeated vomiting, a painful belly, collapse, or a cat that has not eaten for 24 hours and is hiding.
What to do if your cat ate pumpkin seeds
- Check what they were: plain or flavoured, whole or hulled, how many.
- A few plain seeds: monitor appetite, vomiting and the litter tray.
- Seasoned seeds with garlic, onion or a lot of salt, or many whole seeds in a small cat: call your vet or the Animal Poisons Helpline on 1300 869 738.
- Do not try to make your cat vomit at home.
How vets help
Your vet will examine your cat, ask about diet and litter habits, and may suggest blood tests, X-rays or a faecal test. Treatment depends on the cause. For worms, they will recommend a registered product suited to your cat. For constipation, they look for the underlying reason as well as easing the immediate problem.
FAQ
My cat ate one whole pumpkin seed. Is that a problem?
Very unlikely. Watch for vomiting and carry on as normal.
Can I use pumpkin seeds alongside a worming product?
There is no need. Follow your vet's parasite plan as directed.
Can pumpkin seeds cause diarrhoea in cats?
Yes, especially in larger amounts, because of their fat.
Talk with a vet
If your cat has ongoing hairballs, constipation or worm concerns, or has eaten something you are unsure about, a Dial A Vet veterinarian can help you plan the next step. Book a Dial A Vet consult.
References
- Grzybek M, Kukula-Koch W, Strachecka A, et al. Evaluation of anthelmintic activity and composition of pumpkin (Cucurbita pepo L.) seed extracts: in vitro and in vivo studies. International Journal of Molecular Sciences. 2016;17(9):1456.
- Merck Veterinary Manual. Constipation, obstipation, and megacolon in small animals.
- Merck Veterinary Manual. Garlic and onion (Allium spp) toxicosis in animals.
- Cornell Feline Health Center. Feline lower urinary tract disease.
Disclaimer: Educational only. This page does not replace an examination or advice from your own veterinarian. If you are worried about your pet right now, contact your local vet or nearest emergency animal hospital.
