Calendula officinalis is listed as non-toxic to dogs and cats. But we have seen multiple sources say that Tagetes species are mildly toxic to animals. Contact may result in irritation to the skin, while ingestion can lead to GI symptoms. Thankfully, these symptoms tend to be mild. For this reason, marigolds seem to be among the safer options for planting in your garden if you have a pet that wanders around your yard.