YES — Plain lettuce leaves are safe for dogs.
Romaine and iceberg lettuce are non-toxic. Offer plain leaves in small amounts, not leftover salad.
See our guide to vegetables dogs can and can't eat to compare this with the rest of the vegetable list.
Plain lettuce, including romaine and iceberg, is not toxic or harmful to dogs. It is mostly water.
A salad is not the same as lettuce. Leftover salads may contain onions, dressings or other ingredients that are not suitable for dogs.
Large amounts may cause diarrhoea or an upset stomach.
This guide is for general educational purposes and isn't a substitute for advice from your veterinarian. If your dog has eaten something potentially toxic or is showing concerning symptoms, contact a veterinarian promptly.
Last updated 1 October 2026. We write from widely published, mainstream pet-health sources and avoid presenting feeding amounts as veterinary prescriptions.
Vegetables
Spinach is not poisonous to dogs and small amounts are generally tolerated, but its high oxalate content is a reason for caution — particularly for dogs with kidney problems or a history of urinary stones. Serve it plain, chopped and lightly cooked, in small portions.
Vegetables
Kale is not a food to share freely. It contains calcium oxalate, which is why sources advise against it for dogs with a history of kidney or bladder stones, and it can upset the stomach. For other healthy adult dogs, a little plain kale now and then is generally acceptable.
Vegetables
Plain cucumber is a high-water, relatively low-calorie vegetable that most dogs can eat in moderation. The main practical points are cutting it small enough to chew safely and keeping it plain — pickles are not the same thing.
Vegetables
Onions belong to the Allium family, and Allium exposure can damage a dog's red blood cells and lead to anemia. Raw, cooked, dried and powdered onion are all a concern, as are sauces, broths and seasoned dishes that contain them. Contact a vet promptly after any ingestion.