Thanx! Right now I think it may be play, but am worried it may develope into something more serious later. Uma is so funny! Sometimes if it is particularly hard for JUju to get into the room I will hold Uma down and have Juju stand over her....Uma finds this activity very entertaining and I swear the little booger is laughing sometimes! She never hurts Juju,ever, just makes Jujutake 2 steps back for every step forward!