Sorry guys for the delayed update, just got back from the week.
dcmclcm, no he didn't get fed anything. He was sitting next to me when the snap happened.
Patty, my parents have two dogs, and one was barking a few minutes before the incident. Dex hates barking, so he went to swat at her face to essentially tell her to stop. I grabbed him, hence why he was sitting by me when the incident happened. This may have flustered him… not sure how to avoid it though.
krunzer & eeeefarm, there were indeed a lot of people, but not his first family party (first Thanksgiving though)
Hopefully I answered all of the questions. Oh, he is neutered by the way!
I do have an update to share as well. As I mentioned, we had another Thanksgiving party to attend on Friday with people Dexter had never met, including a 2 year old. We were very cautious with him, had the kids put him into a sit and give him a treat, and all was well. I was very proud of how he acted with the 2 year old, being very mild manner and taking the treats from him so gently! It was like he knew that he was dealing with a baby...
BUT, the night didn't go perfect. At a VERY random moment, with no trigger, Dexter went to one of the kids (~10 years old) and jumped up on them and grabbed their sleeve and tugged. He didn't growl at all or seem aggressive, but was doing it just like he does when his rough play gets to be escalated. Whenever he does this at home, I make him stop immediately so that he knows he took it too far. Unfortunately, this instance resulted in us crating him. The next day, he did it again with multiple people he had met several times before! I am completely puzzled, and there was never a trigger for any of the instances. He just randomly would decide he wanted to play rough, and put his mouth on the person's (both adult and child) shirt sleeve with his front legs jumped up on their hips.
At home, there is just the two of us and him, but he is well socialized with people around the area regularly. I want to resolve this rough housing/playful aggression so that it doesn't occur over Christmas when we go back.
Any thoughts on this latest action? It seems too out of no where to not have a meaning behind it.