Rosemary is frequently added to dog foods as a natural antioxidant and preservative. Rosemary extract, like many other plant extracts, contains a variety of natural antioxidants and other components that provide numerous health and functional benefits. It’s also considered an anti-cancer agent by some experts. It is considered non-toxic by the ASPCA Animal Poison Control (https://www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants/rosemary). If rosemary is ingested in large doses, especially in the form of an essential oil, it could potentially cause GI upset in some dogs. We include trace amounts of a high-quality rosemary extract that has different molecular properties than essential oils in our treats.
In small amounts, rosemary oil is often used by holistic veterinarians to treat dogs with anxiety disorders by inducing a calming, relaxing effect. If given or fed in excessive amounts, rosemary essential oil can produce a nearly opposite effect: a nervous system stimulant effect that may exacerbate certain nervous system disorders, including seizure disorders. In general, doses of rosemary oil that do not exceed concentrations greater than 1 percent of the entire composition of a food or supplement product, are prescribed safely by many holistic veterinarians.
There are no medical studies or reports of rosemary extract causing toxicity in dogs.