Oh god ;A; I would NOT know how to deal with a major pet dying. As a kid, I had a cat and a ginuea pig and I ended up having to give them away after a few years in both cases, my first dealing with pet death was last fall, with my hamster Yuki.
Anyway, I try to never think about it, but when my dog Coco goes, I am going to be a wreck. I've had her since the day she was born. She's 8, so she still has a lot of time, she's a chiuahua and they can live to be 20 sometimes. But oh god when it happens. All I know is that I will need a new dog, IMMEDIATELY. Second she's gone, I need a puppy ASAP or I will die.