Katharine, you are right in the overall concept of protein levels.  To
compare foods of different moisture levels you divide the listed protein
level by the percentage dry matter.  This is obtained by subtracting the
moisture or water from 100%.  Yes, low protein from food meant for cats is
not sound advice unless the person making the recommendation does their
homework.  Please see my previous post.
 
Sincerely,
DR Tom Willard
[Posted in FML issue 3409]