I don't know why it's hard to comprehend that the loss of a pet is far worse than losing a person/family to some people. With how nasty, harsh and judgy people are being on this thread it's really no surprise is it?
I lost my last dog 2 years ago and it was probably the most traumatic experience of my life and I don't really care if you think that's pathetic.
I spent 12 years with her, I've always worked from home we were together pretty much 24/7, I'm a homebody, I'm happiest at home with my dog and a book or tv show.
When you've spent 12 years with a constant companion that loves you unconditionally, doesn't judge, makes you laugh, follows you like a shadow and knows when you are sad then losing them is awful.
You have them put to sleep, get back home with your dogs lead/collar in hand, open the door and that little happy face and waggy tail that has been there to greet you every day for 12 years is no longer there. The house is silent, your dog's bed is still there, the toys, treats, food and bowls but no soul.
You go to bed and when you wake up there's not a little dog expecting a morning cuddle, your 12 year routine, no dog to let out, breakfast to make, medication to give walks to take. 12 years of love and routine gone.
You cannot get over that sort of loss in a day or two.