Can cats eat custard? Take care — the catch
Quick answer: Not recommended — custard is best avoided for cats.
Quick verdict
Caution
Key risk
Sugar and lactose can cause diarrhoea and stomach upset.
Why
Custard is sugary and dairy-based, which most cats cannot digest well.
Can cats eat custard, and why?
Custard is sugary and dairy-based, which most cats cannot digest well. Sugar and lactose can cause diarrhoea and stomach upset.
Cats are obligate carnivores: they must get most of their nutrition from meat and need nutrients such as taurine that only animal products provide. They lack some enzymes for processing plants and carbohydrates, so fruit and veg offer little benefit and can upset their stomach; many cats are also lactose intolerant.
Warning — what to watch for
Sugar and lactose can cause diarrhoea and stomach upset.
If your cat has eaten custard, don’t wait for symptoms — contact your vet immediately, or call the Animal PoisonLine on 01202 509000 (24/7, UK). Signs of a problem can include vomiting, diarrhoea, drooling, lethargy, tremors or loss of appetite.
🚨 Find an emergency vet near youMore foods cats might eat
Feed cats safely
Portion control and slow feeding help when a food needs care:
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Feeding & nutrition guides
Frequently asked questions
Can cats eat custard?
Caution. Custard is sugary and dairy-based, which most cats cannot digest well.
What happens if my cat eats custard?
Sugar and lactose can cause diarrhoea and stomach upset. If your cat has eaten custard, contact your vet or the Animal PoisonLine (01202 509000) straight away — don’t wait for symptoms.
Is custard poisonous to cats?
Caution. Custard is sugary and dairy-based, which most cats cannot digest well.
Free printable: safe & toxic foods for cats
custard is just one food — get the full one-page checklist of what’s safe, fine in moderation, or dangerous for cats. Vet-sourced, yours to print and keep.
Check custard for another pet
Sources
Our verdict on whether cats can eat custard draws on established UK and US veterinary and welfare organisations. Individual pets, quantities and preparation vary — always confirm with your own vet.