Another thing -- I think the slippery elm by itself is sketchy tasting. It tastes like it smells.
However, mine LOVE bovine colostrum (I think it reminds them of nursing as puppies--their reactions are kind of funny). I can mix a scoop of bovine colostrum powder, open up a capsule of slippery elm, add some probiotic, and maybe a half a cup of filtered water, and most dogs will slurp it down. Their love of the colostrum overrides the slippery elm taste.