(I had this the same night as the theater dream and my sister is in this dream as well.)
My sister and I are in a big bathtub taking a bath. It is an L-shaped bath tub so I can fit on one end and she can fit on the other. A friendly black dog (in the dream I had the impression this was our pet who wanted to be with us) wanted to get in with us in the middle. While he/she was a nice dog - there wasn't much room to take a bath even though it wanted to be with us. We decided it was best if it got out because we would have more room.
(My sister and I live together and are currently pursuing God through this season. While our paths and callings are different we are close and often share what God is showing us individually to encourage each other's faith and pray for each other. I have had a few dreams in 2019 with my sister in it so I'm trying to pay attention to them even if they are short and strange like this one. I believe this dream relates to the spiritual journey and sanctifaction we are both on right now. However I am unsure of the meaning of the L-shaped bath tub or the use of the friendly dog. I have had friendly black dogs in my dreams before and they have always been friendly, not scary, however they have been in places they shouldn't much like a pet would)