Ah, wee angels.  Butter wouldn't melt in their mouths.  They do generally play well together.  What you don't see here, of course, is Joey then getting a bit stroppy with Izzy, who then cross.  Joey shows no empathy, gets all indignant and bolshy with us and then ends up being sent to bed early.  He was very upset afterwards but he does need to learn and we have been lenient with some of his behaviour in the past.  On the plus side, he was much better the day afterwards.  A good bollocking does him good from time to time.