Something kind of odd just happened...?

I am at home cause I just got back from taking a final at school today. Anyway, my mom is asleep downstairs on the couch and I went downstairs because I was going to let my two cats eat their food so I had to go settle down my dog and get him to lay down for a bit so that they both could come downstairs and eat (the dog always like attacks them when they are eating cause he is crazy and annoying). So, I went downstairs to get the dog to lay down and he ended up making me chase him around the island in our kitchen, which is next to the living room and the couch where my mom is sleeping right now.

Anyway, I kept chasing the dog around the island and at the climax of this chase I finally caught up to him and made him lay down (I had to grab his ear and push him down, cause he is a large German Shepherd) and he let out a squeal like he always does. We had been making a lot of noise chasing each other, and then he finally got loud, and at the same time as he squealed my mom screamed something that sounded like "OW!" or "NO!". Right when she said that I thought that we had woken her up with all the noise or whatever, but nothing happened after that: she didn't wake up or even move or say anything else.

This is kind of odd because I am thinking that she was dreaming about something (she often has very physical dreams) and the noise that my dog and I were making she was hearing in her dream, and when my dog finally squealed she also heard that in her dream. It makes me think that the noises were actually made part of her dream, since I have experienced this before (the external noise that occurs from outside somehow coincides with what is happening in my dream). Does anyone have a guess if this was what was happening?