Orchids are considered plants that are safe for dogs and other pets. In fact, almost all pure Orchid species are regarded as harmless. Although it’s rare, there are a couple of Orchid species that are considered mildly toxic. The Lady Slipper Orchid is known to be mildly toxic and may cause some gastrointestinal upset if ingested.
You also want to be careful of hybrid Orchids as there may be compounds introduced in the cross that could make your pet sick. In this case, it’s best to stick to pure Orchid species and to thoroughly look into any hybrid species before you bring them into the home you share with your dog.