Can a dog scare themselves for howling for the first time?

My dog is nearly a year old. I’ve had her for 10 months. I’ve heard her bark, growl or whine or yelp. But today she was playing with her squeaky toy and howled a deep howl, like wolf. She is a small mix breed that is probably Chihuahua and french bull dog.
Any how. Right after that she stopped squeaking her toy and laid quietly on it as if in shock. She didn’t even want to play. It took a few minutes but then she was ok. I tried to get her to howl again but she won’t do it. I know dogs sometimes howl with certain high pitch sounds and I think that is what cause her to howl.
But I was wondering if she maybe hurt herself howling, or was just shocked that she could do that?