Pet safety
Is Cos Romaine Lettuce toxic to dogs?
Lactuca sativa var. longifolia 'Cos'
No — cos romaine lettuce is listed by the ASPCA as non-toxic to dogs. It is a sensible choice for a home with a dog; a curious nibble will not poison them, though no plant is meant to be eaten. This classification follows the ASPCA Toxic and Non-Toxic Plant List. Cultivated lettuce (Lactuca sativa) is considered non-toxic to cats and dogs and is not on the ASPCA list of toxic plants. It is high in fibre and water, so large quantities can cause mild digestive upset; offer only as an occasional treat in small amounts.
Is cos romaine lettuce toxic to dogs? — FAQ
Is cos romaine lettuce toxic to dogs?
No — cos romaine lettuce is listed by the ASPCA as non-toxic to dogs. It is a sensible choice for a home with a dog; a curious nibble will not poison them, though no plant is meant to be eaten. Cultivated lettuce (Lactuca sativa) is considered non-toxic to cats and dogs and is not on the ASPCA list of toxic plants. It is high in fibre and water, so large quantities can cause mild digestive upset; offer only as an occasional treat in small amounts.
Is cos romaine lettuce safe for dogs?
Yes — the ASPCA lists cos romaine lettuce as non-toxic to dogs and dogs. A dog that chews a large amount of any foliage can still get a mild, brief stomach upset, so discourage grazing, but it will not be poisoned.
Is cos romaine lettuce toxic to cats too?
The ASPCA classification Growli uses applies to both cats and dogs: Cos Romaine Lettuce is non-toxic to cats as well. See the full cos romaine lettuce pet-safety guide for both species.
What other plants are safe for dogs?
Reliable ASPCA non-toxic picks for a dog home include spider plant, calathea, parlor palm, peperomia, and most true ferns. Browse the best dogs-safe plants list to check more before you buy.
Type any plant to see what the ASPCA says about it and your dog.
Full cos romaine lettuce pet-safety
- Is lettuce toxic to dogs? — the species this cultivar belongs to, checked separately
- Is cos romaine lettuce toxic to cats and dogs? — the full guide for both pets
- Is cos romaine lettuce toxic to cats?
- Best dogs-safe plants — the full ASPCA non-toxic list
- Complete cos romaine lettuce care guide
- Best plant app for pet owners — which apps actually flag ASPCA toxicity before you buy the plant
Writing about plant safety? Embed our free pet-toxicity checker on your site — ASPCA-grounded verdicts for 11,000+ plants, no sign-up.