Cats & Dogs
Generally safeConsulted references do not classify the plant as toxic for that pet type, while still allowing for mild GI upset if large amounts are chewed.
Sources

Goeppertia insignis
Goeppertia insignis, formerly known as Calathea lancifolia, is a popular ornamental houseplant prized for its patterned, lance-shaped leaves. It is widely considered non-toxic to household pets.
Safety status
Cats & Dogs
Generally safeConsulted references do not classify the plant as toxic for that pet type, while still allowing for mild GI upset if large amounts are chewed.
Sources
If a pet has chewed or swallowed plant material and is showing symptoms, contact a veterinarian or poison resource immediately. This product is for structured reference, not diagnosis.
Cats — concern notes
Common signs
None expected. Ingestion of any plant material may occasionally cause mild gastrointestinal upset such as vomiting or diarrhea due to physical irritation.
Escalation note
This plant is not listed as toxic by major veterinary poison control centers. If your pet exhibits persistent vomiting or lethargy, consult a veterinarian.
Dogs — concern notes
Common signs
None expected. Ingestion of any plant material may occasionally cause mild gastrointestinal upset such as vomiting or diarrhea due to physical irritation.
Escalation note
This plant is not listed as toxic by major veterinary poison control centers. If your pet exhibits persistent vomiting or lethargy, consult a veterinarian.
Bring it home
Rattlesnake Plantis generally pet-safe in ordinary household exposure. If you’d like one for your space, here’s a starting point.
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ASPCA Toxic Plant List
veterinary · 100% reliability
Rattlesnake Plant (Calathea lancifolia) is non-toxic to dogs and cats.
Plants of the World Online (POWO)
botanical · 100% reliability
Accepted name for Goeppertia insignis (W.Bull) J.M.A.Braga.
Same safety verdict

Garden cosmos is a daisy-like annual usually treated as a pet-safe flowering option, though any large plant ingestion can still cause mild stomach upset.
Generally safe for cats & dogs.

African Violets are popular, low-growing flowering houseplants known for their fuzzy leaves and vibrant blooms. They are considered non-toxic to both cats and dogs.
Generally safe for cats & dogs.

The spider plant is a popular, easy-to-care-for houseplant known for its arching, grass-like foliage and trailing plantlets. It is widely considered safe for households with pets, though large ingestions of fibrous material may occasionally cause mild digestive upset.
Generally safe for cats & dogs.

Acorn squash is a popular edible winter squash known for its ribbed, dark green skin and sweet, yellow-orange flesh. It is widely cultivated for culinary use and is considered safe for household pets.
Generally safe for cats & dogs.