Romeo and Rafikki are 8 year old Burmese males who are neutered, indoor cats, and who have lived in harmony up until 3 months ago. They have suddenly started fighting and I am now desperate !! We have tried Feliway, Anxitane, Calm Ease and Tranquility tablets from Australia. Last week, in desparation , I took them to our beach cottage (2 hrs away) to see a vet . On arriving at the cottage , they were once again happy and lovable and there was not one fight. The vet saw them and said they are both healthy. After staying there for 4 days I returned home and the fighting started up immediately . Nothing has changed in our home but there is a feral cat in our yard. We are trying to catch it and I v put up 2 sonic devices. Does anyone think that my cats will stop fighting once we v got rid of the feral cat ? I have separated them but as soon as i let them out together, Rafikki starts cowering and hides under a chair, as if he sees Romeo as an enemy. How am I going to fix this?Please can anyone help me.