is a christmas cactus poisonous to dogs

*Frosty is concerned about your safety. He knows that some holiday plants can be toxic to pets, so he is careful to check his facts.* I'm not sure about Christmas cactuses specifically, but some types of cactuses can be toxic to dogs if they ingest them. It's best to keep your pet away from any plants that you're not sure about, and to always check with your vet if you have any concerns.