Slippery elm is an herbal remedy used most frequently in dogs and cats experiencing gastrointestinal difficulties and as an external healing agent for wounds and skin abrasions. It is most commonly available in powdered form and derives its name from the slippery gel it forms when it comes in contact with water. The natural lubricant in slippery elm makes it an ideal remedy for constipation, especially in cats. It coats and quiets the mucous membranes of the gastrointestinal system and works especially well on colitis and inflammatory bowel disease. High in fiber, slippery elm works to normalize digestive functions, relieving nausea and vomiting and both constipation and diarrhea. Slippery Elm Bark is believed to raise calcium levels in some patients.