Groomers trip didn’t go too well😳

So I took my dog to the groomers today and I was in shock when I got there because the first thing they said was has your dog been acting weird and I said other then peeing around the house and being clingy to me no? I was sooo confused why they were asking. (I thought maybe because they see my belly ?) Well turns out he took a big chunk off the groomers thumb when she tried to flip him from behind ... I felt sooo bad because he has never done this and he’s just a mid size Pomeranian. But the way she described the chunk seems bad. In fact my friend who is a groomer she would even brush his teeth without a problem !! So I was super shocked to hear the news. She said maybe since baby is getting closer to being born he might be acting like territorial but still confused because he has never bite anyone when I take him to the groomers!! Has anyone else’s dog been acting this weird ?!