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Entry 686Filed under Breeding

Fall Plants and Pets: Which Are Toxic and Which Are Non-Toxic?

Mums are toxic to dogs, cats, and horses; red maple leaves are a distinct risk for horses. Learn what ASPCA’s fall-plant classifications mean for pets.
2-minute read By Animalso Team
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For pets, fall plants are not a simple safe-or-dangerous group: mums are toxic to dogs, cats, and horses, while several other plants on ASPCA’s fall list are classified as non-toxic. Red maple is an important exception by species: its leaves are toxic to horses, especially when wilted, but are listed as non-toxic to dogs and cats. These classifications are not permission for pets to chew plants; even non-toxic plant material may cause mild stomach upset.

Which fall plants are hazardous to pets?

ASPCA’s seasonal list, published October 7, 2025, distinguishes plants by toxicity and, in some cases, by animal species and plant condition. The classifications below are pet-safety guidance, not a complete review of plant risks to people.

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Plant ASPCA classification Important details
Mums (Chrysanthemum spp.) Toxic to dogs, cats, and horses Reported signs include vomiting, diarrhea, and excessive salivation. ASPCA’s plant entry also lists incoordination and dermatitis. Toxic principles include sesquiterpene lactones, pyrethrins, and other potential irritants.
Red maple (Acer rubrum) Non-toxic to dogs and cats; leaves toxic to horses Wilted leaves are a particular concern. Reported signs in horses include anemia, weakness, dark urine, breathing difficulty, abortion, and possible death.
Asters (Callistephus chinensis) Non-toxic to dogs, cats, and horses ASPCA’s seasonal article contrasts asters with toxic mums, although both are commonly available in fall.
Russian sage (Perovskia atriplicifolia) Non-toxic to pets This is a toxicity classification, not a guarantee that eating it will cause no symptoms.
Caryopteris (Caryopteris clandonensis) Non-toxic to pets ASPCA’s seasonal article spells the species epithet “clandonenis.” Confirm the plant’s identity rather than relying on a common name alone.
Pansies (Viola tricolor var. hortensis) Non-toxic to pets ASPCA also notes their frost tolerance as a gardening attribute.
‘Karl Foerster’ feather reed grass (Calamagrostis acutiflora) Non-toxic to pets, with a mechanical-injury caveat Grass awns can rarely migrate through body tissues and cause mechanical injury; ASPCA advises avoiding exposure.

Sources: ASPCA’s October 7, 2025 fall-plant article, ASPCA’s mum entry, and ASPCA’s plant database.

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What “non-toxic” does—and does not—mean

ASPCA’s non-toxic label describes a toxicity classification; it does not mean a plant is safe for a pet to eat. ASPCA cautions that consuming any plant material may cause mild gastrointestinal problems and recommends preventing pets from eating plants. A pet’s reaction also depends on what plant and part were eaten, so do not infer safety from a fall bloom’s appearance or from another animal’s classification.

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What to do if a pet eats a fall plant

  1. Identify the plant if you can. Note the plant’s name and which part may have been eaten. ASPCA’s database advises checking the plant name; the FDA’s pet-safety guidance also notes that the part eaten can matter.
  2. Contact a veterinarian or ASPCA Poison Control immediately if exposure to a poisonous or potentially toxic plant is suspected. ASPCA lists its 24-hour Poison Control number as (888) 426-4435. Do not wait for symptoms before following that advice.
  3. Follow professional instructions. ASPCA’s general plant database advises contacting a veterinarian or its emergency poison hotline if an animal may be ill or may have ingested a poisonous substance.

ASPCA’s 2025 seasonal article gives the same immediate-contact advice for suspected exposure.

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What if a person may have eaten a plant?

This article’s plant classifications are for pets, not a complete human toxicity guide. For a possible human plant ingestion, use webPOISONCONTROL or call a poison center. The plant’s identity and the part eaten may affect the risk.

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