Is Moss Rose Toxic to Dogs? Portulaca Safety

Name: Is Moss Rose Toxic to Dogs? Portulaca Safety
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

Is moss rose toxic to dogs? For the ornamental moss rose most people grow in hanging baskets and rock gardens, Portulaca grandiflora, the answer is generally no. It is not listed among the plants that commonly poison pets, and it does not appear on the ASPCA's toxic plant list. The confusion starts with names, because "moss rose" is also used for purslane, Portulaca oleracea, which is listed as toxic to dogs, cats, and horses [1][2].

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

Ornamental moss rose (Portulaca grandiflora) is generally considered non-toxic to dogs, and it is not on the ASPCA toxic plant list.
The plant listed as "Moss Rose" and "Portulaca" by the ASPCA is Portulaca oleracea, also called purslane, pigweed, or pusley, and it is toxic to dogs, cats, and horses because of soluble calcium oxalates [1][2].
Reported signs from that toxic plant include muscle weakness, depression, diarrhea, tremors, salivation, and, rarely, kidney failure in dogs and cats [1][2].
If your dog eats any part of a moss rose plant and you are not certain which species it is, treat it as a possible exposure and call for advice.
Never induce vomiting unless a veterinarian tells you to.

Is Moss Rose Toxic to Dogs? What the Plant Lists Actually Say

The name problem is the whole story here. Two plants share the common name moss rose, and they have very different safety profiles.

Portulaca grandiflora is the flowering annual sold in garden centers as moss rose, rock rose, or portulaca. It has fleshy, needle-like leaves and cup-shaped flowers in bright colors. It is widely grown in containers, borders, and dry sunny spots. This is the plant most dog owners mean when they ask about moss rose.

Portulaca oleracea is a different species. It grows as a low, sprawling weed in lawns, cracks in pavement, and vegetable gardens. Common names include purslane, pigweed, pusley, wild portulaca, rock moss, and moss rose [1][2]. The ASPCA lists this plant as toxic to dogs, cats, and horses, with soluble calcium oxalates as the toxic principle [1][2].

So the practical answer depends on which plant is in your yard. If you planted moss rose from a nursery six-pack, your dog is likely fine. If your dog grazed on a weed that looks like a succulent ground cover, that could be purslane, and that is a different situation.

Which Parts of the Plant Matter

For purslane, the toxic principle is present in the plant tissue, so any part the dog chews or swallows can matter [1][2]. There is no evidence that one part is safe while another is dangerous. The ASPCA record does not single out leaves, stems, flowers, or roots as the only problem area [1][2].

For ornamental moss rose, there is no established toxic principle in the veterinary literature. That does not mean a dog can eat unlimited amounts with no consequences. Any plant material can cause stomach upset in a dog that eats a lot of it, especially if the dog is not used to eating plants.

Seeds, Soil, and Garden Products

The plant itself is only part of the picture. Fertilizers, potting mixes, pesticides, and slug baits around the plant can be far more dangerous than the plant. If your dog digs in a pot, the risk may come from what is in the soil, not the moss rose.

One interesting note for gardeners: a 2025 study found that adding dog fur to potting mix improved growth in basil, lettuce, and marigold compared with a standard mix [3]. That is about gardening, not about dog safety, but it is a reminder that what goes into the pot matters as much as the plant.

The Toxic Principle: Soluble Calcium Oxalates

Soluble calcium oxalates are the toxic principle listed for purslane [1][2]. These are different from the insoluble oxalate crystals found in plants like peace lily and philodendron, which cause intense mouth burning and drooling. Soluble oxalates are absorbed from the gut and can affect the body internally.

When a dog absorbs a meaningful amount of soluble oxalate, the oxalate binds calcium in the body. This can lead to low blood calcium and can contribute to kidney injury. The ASPCA lists kidney failure as a possible sign, though it notes this is rare in dogs and cats [1]. Other listed signs include tremors and salivation [1].

The same plant record also lists muscle weakness, depression, and diarrhea [2]. The two ASPCA entries describe the same plant under different common names, and the sign lists overlap and differ slightly. In practice, a dog that eats purslane may show stomach upset, weakness, or neurologic signs, and severe kidney effects are possible but uncommon [1][2].

Soluble oxalate plants appear in veterinary toxicology reviews of pet poisonings worldwide, which confirms that this category of plant is a recognized concern for dogs and cats [4].

Signs of Poisoning and Typical Timeline

Signs depend on how much plant the dog ate, the dog's size, and how much of the plant was actually purslane. There is no published dose threshold for dogs in these records, so your veterinarian will assess your dog based on weight, amount eaten, and clinical signs.

Signs listed for the toxic Portulaca oleracea include:

Muscle weakness [2]
Depression or lethargy [2]
Diarrhea [2]
Tremors [1]
Salivation [1]
Kidney failure, described as rare in dogs and cats [1]

Timing is not precisely established in these records. In general, soluble oxalate effects follow absorption from the gut, so signs would be expected within hours of a significant ingestion. Kidney injury, when it happens, can develop over a day or more. If your dog ate a small leaf and is acting completely normal, that is reassuring, but it does not replace a call to a professional.

When It Is Probably Not the Plant

Dogs vomit and have diarrhea for many reasons. If your dog has a sudden upset stomach and you also found chewed plant material, the two may or may not be connected. Tell your veterinarian exactly what you saw, how much you think was eaten, and when. That history helps more than a guess about the plant's identity.

What to Do Right Now

If your dog ate moss rose or purslane, act based on what you know.

Remove your dog from the area and take a photo of the plant. A clear photo of leaves and flowers helps identify the species.
Note the time and how much you think was eaten.
Call your veterinarian, the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661.
Do not induce vomiting unless a veterinarian tells you to. Inducing vomiting can cause harm if the wrong substance was eaten or if the dog is already weak.
Do not give food, milk, oil, or home remedies unless a veterinarian instructs you.

If your dog is vomiting, weak, trembling, drooling heavily, or not acting like themselves, treat it as an emergency and go to a veterinary hospital. If your dog seems fine after nibbling an ornamental moss rose flower, a phone call is still the right first step, because plant identification over the phone is imperfect.

For more on what to do after any plant exposure, see Dog Ate Toxic Plant.

Veterinary Treatment for Suspected Portulaca Poisoning

Treatment is supportive and depends on the signs. Your veterinarian will start with a physical exam, a history, and likely blood work to check kidney values and electrolytes. If the dog is dehydrated or vomiting, intravenous fluids are common. If blood calcium is low, the veterinarian may treat that directly. The dose and choice of any medication are calculated by your veterinarian from your dog's weight and health, not from a home chart.

If the ingestion was recent and the veterinarian decides decontamination is appropriate, they may induce vomiting in the clinic or give activated charcoal. That decision is theirs to make. Never do it at home on your own.

If kidney injury develops, treatment may include hospitalization, fluid therapy, monitoring of urine output, and repeated blood work. Severe kidney failure from soluble oxalates carries a guarded outlook, which is why early evaluation matters.

What Not to Expect

There is no antidote that reverses soluble oxalate poisoning. Care is about supporting the body, protecting the kidneys, and treating signs as they appear.

Outlook After Eating Moss Rose

For ornamental Portulaca grandiflora, the outlook is generally good, because it is not a recognized toxic plant. A dog that eats a few leaves or flowers may have mild stomach upset or no signs at all.

For Portulaca oleracea, the outlook depends on the amount eaten and how quickly care is started. Many dogs that eat a small amount do well with supportive care. Dogs that develop kidney injury have a more serious prognosis [1]. The ASPCA describes kidney failure as rare in dogs and cats from this plant, which is encouraging, but rare is not the same as never [1].

Prevention and Safer Alternatives

The simplest prevention is identification. Know what is growing in your yard and in your pots. If you are not sure whether your ground cover is ornamental moss rose or weedy purslane, take a sample or a photo to a nursery or your veterinarian.

Other practical steps:

Keep pots and garden beds out of reach if your dog is a chewer.
Train a "leave it" cue and reward your dog for ignoring plants.
Offer safe chew alternatives so your dog is not looking for entertainment in the flowerbed.
Supervise your dog in the yard during the first seasons after planting.
Store fertilizers, pesticides, and baits where your dog cannot reach them.

If you want to fill a garden with plants that are safer choices for pets, see Plants That Aren't Toxic To Cats And Dogs. If you are choosing indoor plants, Common Houseplants Toxic to Cats and Dogs covers the ones most often involved in poisonings.

Watch Out for Lookalikes

Moss rose is not the only plant that can be confused with something else in the garden. Jimsonweed (Datura stramonium) is a toxic ornamental that caused pupil asymmetry in dogs after simple eye contact with any part of the plant in one report [5]. That is a different plant with a different mechanism, but it shows how much plant identity matters. If you cannot identify a plant with confidence, keep your dog away from it and ask for help.

Limitations and When to Contact a Veterinarian

No article can tell you what your individual dog will do after eating a specific plant. Individual cases need a veterinarian who can examine your dog, ask questions, and run tests if needed.

Contact a veterinarian the same day if your dog ate plant material and you are unsure of the species, if your dog has mild vomiting or diarrhea, or if your dog seems a little quiet or off.

Go to an emergency clinic now if your dog is trembling, weak, collapsing, drooling heavily, vomiting repeatedly, breathing abnormally, or producing little or no urine.

Schedule a routine visit if your dog has had repeated plant-eating episodes, if you want help dog-proofing your yard, or if you need a plant identified before you decide what to remove.

Frequently Asked Questions

Is Portulaca grandiflora safe for dogs?

Ornamental moss rose, Portulaca grandiflora, is generally considered non-toxic to dogs and is not on the ASPCA toxic plant list. The plant that is listed as toxic is Portulaca oleracea, which shares the moss rose name. If you are not sure which one you have, treat it as a possible exposure and call for advice.

Can my dog eat moss rose flowers?

A dog that eats a flower or two of ornamental moss rose is unlikely to have serious problems. That said, any plant material can cause stomach upset, and you should still watch for vomiting, diarrhea, or lethargy. If signs appear, call your veterinarian.

What happens if a dog eats purslane?

Purslane contains soluble calcium oxalates, and reported signs include weakness, depression, diarrhea, tremors, salivation, and rarely kidney failure in dogs and cats [1][2]. The outcome depends on how much was eaten and how quickly care starts. Call a veterinarian or a poison control line right away.

Should I make my dog vomit after eating moss rose?

No. Do not induce vomiting unless a veterinarian tells you to. Vomiting can be harmful in some exposures, and the decision depends on what was eaten, when, and your dog's condition. Call your veterinarian or a poison control line first.

How do I tell moss rose apart from purslane?

Ornamental moss rose is usually a tidy, low-growing annual with needle-like fleshy leaves and showy flowers in bright colors. Purslane is a sprawling weed with broader, paddle-shaped leaves and small yellow flowers, and it often shows up in lawns and pavement cracks. If you cannot tell them apart, take a photo and ask your veterinarian or a nursery professional.

References

Toxic and Non-toxic Plants: Moss Rose. ASPCA Animal Poison Control Center.
Toxic and Non-toxic Plants: Portulaca. ASPCA Animal Poison Control Center.
Beneficial effects of dog fur as a potting soil component. microPublication biology, 2025.
Potential plant poisonings in dogs and cats in southern Africa. Journal of the South African Veterinary Association, 2009.
Anisocoria in the dog provoked by a toxic contact with an ornamental plant: Datura stramonium. Veterinary ophthalmology, 2002.