l have a white round pill. On one side there is a giant M and on the other, I can't read it because my dog tried to eat it. It is scored on the side without the M. It looks like there's writing on either side of the scoring. The M runs vertical to the scoring on other side. I think I can see 54 on one side of the scoring, but may be wrong. Any help would be appreciated, so I can find out what my dog tried to eat. Thanks! I'm pretty sure it was made in the US, I don't know though.