As a rule our two cats, Tristan and Isolde, get on well together. They chase each other around the house for fun and cuddle up together on the bed, but there is one thing that causes war to break out between them. It is the old cardboard box behind my computer screen. Tristan believes it is his box and Isolde thinks that she should have it. Sometimes, when he isn’t lying in it, she will sneak in and try it on for size, and emerge with a look of smug self satisfaction on her face. But if he’s using it she will either pretend that she couldn’t care less about his box or it will be all out war. Tristan is much bigger than Isolde so the outcome is not often in doubt, but she doesn’t know the meaning of the phrase ‘give up’ and sometimes I have to separate them. On occasions offering Tristan another box works, for a while.