I have a very vivid memory that's not mine?

(Fair warning, theres mention of animal death but nothing descriptive)

Two nights ago, I was suddenly hit with a memory. I was 15 (and a dud knelt down in the grass of my backyard, holding my old wire-haired dog (yknow the medium gray ones with the mustaches) while he died. I was sobbing, I wasn't ready to loose him. Life was hard enough as it was. I remember my mom standing behind me on the back porch with a pitiful, sorrowful look, dad with his arm around her. I remember the lemon tree not quite in the corner making that gently rustling sound and the quite creaking of the small, dirt-stained fence that protected my mom's tulips. It would've been a beautiful if my dog hadn't died.

The thing about all this is that it never happened. I've never had a dog I dont have a grass yard, and I didnt look like the guy I was from what I could see. I'm pretty much completely certain that it's just a resurfaced dream that I forgot about or a story I made up when I was younger but still. It's weird. I know exactly what this boy was feeling and kinda who he is. I have a very active imagination so it's really not that strange but still a little odd.

Is it normal to have something like this happen?