We have two kitties, around 5/6 months old now. They normally get on great, always stick together.
Only time they seem to fall out is when Tasha our girl kitten is playing with her favourite toys. She has little mice that she gets very possessive of, sits with them, hides them etc. When she is playing with the mouse, and Peanut the boy cat wants to join in, she growls at him, fights him and then runs away to hide her mouse somewhere else.
I feel bad for peanut, but not sure if i shojld leave them to figure it out themselves, or whether i should be intervening when they start growling at eachother?
Photo for cat tax!