[LRiffe]

My 8 year old female yorkie started having muscle cramps in her right front leg. Last Wednesday (1-5-10) after work, we started our normal routine of playing when she suddenly stopped and it looked like her right front leg was being pulled up and out. She became very scared and yelped when I grabbed her and massaged it away, then she was fine. Then, last night at about 4 a.m., I awoke to her yelping and my wife trying to massage them out, but they kept coming back. We've been to the vet twice today, he took xrays, prescribed muscle relaxers and gave her a shot for pain. That was about 10 am, and she just had another one not ten minutes ago. Does anyone have any idea what causes these, and if there is anything that we can change as far as diet, or vitamin supplements, whatever that will make this stop? These cramps just started out of nowhere and we're afraid of leaving her alone because they are obviously so painful. Any help would be greatly appreciated.