Not all succulents are poisonous to dogs and cats. Succulents are great for pet owners, as most types are perfectly safe for pets. Sempervivum, Burros Tail, Christmas Cactus, Zebra Haworthia, e.t.c., are succulent species that are safe for pets. Other succulent species like the Jade plant, Aloe Vera, Fiddle leaf, e.t.c., are poisonous to dogs.