Updated 1/2/24 Slippery elm bark is an amazing herb, and unlike many plants, it is extremely safe for cats! Caution: As you may know, it is potentially dangerous to give herbs to pets, especially cats. Many people commonly extrapolate a dose of herbs by using the pet’s weight compared to the “standard” 150-pound human. A large dog, however, has a comparatively slow metabolism, while a small dog’s rapid heart rate and high energy level may make it difficult to get the desired effect. Cats have very different metabolism and enzymes, and ...