Friends Once More!
My two Siamese cats (mother and daughter) had become very unfriendly with each other, often hissing, spitting, growling and chasing. As well as this behaviour, one (or maybe both) had begun 'territorial marking' up the walls etc. I tried the usual Feliway and Feliway Friends but it made no difference. I then sent for the Home Comfort diffuser and this seems to have done the trick. They are friendly once more and the marking has stopped. Be aware, though, that you need to send for the Home Comfort diffuser as it diffuses at a different rate to the Feliway. I did not realise this and initially used a Feliway diffuser which meant it only lasted about 12 days instead of the stated 30 days.