Can dogs eat lettuce?
AKC says romaine, arugula and iceberg lettuce are safe for dogs in moderation. Lettuce is about 90% water, and too much can cause diarrhea (AKC).
How to serve it: plain, washed, chopped rather than whole leaves
Good to know: Mixed salads often contain ingredients that are toxic to dogs, such as onions – share only plain lettuce (AKC).
How much is okay
All treats together: at most 10% of daily calories. Enter your dog’s weight:
Lettuce
up to 13.0 oz a day
370 g · about 61½ inner leaves
10% of 629 kcal a day, for a spayed or neutered dog with normal activity. If your dog gets other treats too, give less.
Questions
What amount of lettuce is okay for my dog?
All treats together: at most 10% of daily calories. For a spayed or neutered dog with normal activity weighing 22 lb, that’s up to 13.0 oz (370 g) (about 61½ inner leaves) a day. Work out the amount for your dog above.
Can cats eat lettuce?
Yes, in small amounts. VCA says lettuce is very low in calories and works as a snack for senior cats. Vegetables stay a rare extra for cats; treats at most 10–15% of daily calories (Cornell).
Sources
- AKC – Can Dogs Eat Lettuce?
- Pet Poison Helpline – Pet Friendly Human Food (lettuce; pets in general)
- Nutrition data: USDA FoodData Central (17 kcal per 100 g)
Last checked: October 2026