I get the stuff in the pharmacy at Wal Mart, I think its nature valley or something like that. And I believe they are 1000 mg. My old half Britt / half pointer was around 75 pounds, I would give him two pills once a day. If I missed a day he could barely get up and walk. I have an EP that is about 45 pounds and give him one a day.
Haven't had it in years but never spit any out.