PLEASE HELP! My Tonk won't stop pooping!

  
Tonka

1091334
 
 
Purred: Sat Jan 23, '10 9:00am PST 
My Tonka has been having tummy isssues since the first day I got him, I took him to the vet numerous times. They gave him antibiotics couple of times, with a temp relief of the problem. I also feed him dry cat food called ID. But he still has very loose stool, and goes to the litter box excessively. He has bouts of expolisive diarrea. The vets tell me it's nothing. Please help if you have had the same problem with your Tonk.