Senior Blend. Intended as a whole body, mind, and spirit tonic for older dogs and cats. Senior Blend contains a broad array of what herbalists consider "tonic herbs". Alfalfa, Dandelion and Milk Thistle for strengthening liver function and digestion; Ginkgo and Hawthorn for the circulatory system, Oatstraw for the nervous system, Garlic as an antioxidant and immune system tonic, and Marshmallow to soothe and tonify the urinary and digestive tract. Many holistic veterinarians believe this blend may help strengthen the kidneys