Whenever my older smaller pup enters a room first Uma is alright with it..no probs. However, if larger younger Uma enters the room first poor little Juju is playfully attacked and play growled at by Uma. Juju can hardly enter the room when this happens! I have tried to stay between the two but Uma is quick and very focused on running interference on Juju. I have tried to hold Uma back so Juju can enter first, but you would think it was the most important thing that Uma enter first. All other times they are fine together,although Juju does occassionally hump poor Umas' head. I can bearly get in the room first myself! However Uma does NOT make me run the gamut, she will just whip around and pounce on Juju! Never seen this befor...is it normal for Yorkies? Should I worry about the play growls becoming more serious down the road? Any input would be appreciated.