Oh MY!
I had something like that happen with my lasha and shih tuz. Sammy was the alpha..grumpy man

. Bailey was my dd dog and we had to take him

.. Bailey grew to 26 lbs... Sammy is about 15 lbs. Sammy's day as the "boss" were over

. We still feed Sammy first ..put leash on him first etc. but we all know who really is the "boss".... the 5.5 lb yorkie

REMY!!!