All of the plants you have listed are considered to be pet-safe: Snake Plant, Aloe Vera, Boston Fern, Spider Plant, and Peace Lily.

Snake Plant, Aloe Vera, Boston Fern and Spider Plant are all considered to be non-toxic to dogs and cats.
Peace Lilies are also considered to be non-toxic to dogs and cats, however, ingestion of the plant's sap can cause irritation to the skin and mouth of some animals.

It's always best to keep plants out of reach of pets, as they can still cause digestive problems if ingested in large amounts.
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