The hen and chicks Sempervivum isn't known to contain any toxic compounds. It's considered a safe plant to grow around pets and children. The American Society for the Prevention of Cruelty to Animals (ASPCA) states hen and chicken Sempervivums aren't toxic to dogs, cats, or horses.Hens and Chicks (Sempervivum tectorum) are low growing evergreen succulent plants that look a little like rubbery roses. They are considered alpine or rock garden plants, because of their hardiness and drought resistance. The original rosette, the 'Hen' produces tiny rosette offsets that are known as the 'Chicks. '