We have had this on and off since we had Stanley. Gave a worming tablet suggest by the vet. I was swapping his Royal Canin to Harringtons. Stopped then it stopped. Moved slower to harringtons and again got to 50.50 and it started again. Spoke to vet who has said just keep him on the Canin, might be an allergy to chicken as we were using as high value reward! He is absolutely fine in himself and eating like a piggy.... Moved all treats to fish as suggested by the vet. He doesnt seem worried and offered a paste to harden! Does anyone have any further advice??? Please??? I'm getting worried !!!