Although I posted here after losing a kitty, I know the pain you are feeling from the loss of your beloved dog. On September 15, 2004, I lost my best friend, a shepherd husky mutt named Panda. It was a Wednesday afternoon, late in the day, when I came home and found her in very rough shape (she was 13 and had K9Addison's disease.) She passed at the vet's a few hours later.
I could not go to work until the following Monday. I worked in a hospital as a social worker and it was just awful. I've lost both my parents and the loss of Panda hit me harder than either one of my parents' deaths.
When I did go to work Monday, throughout the day, I hung in my office as much as possible. Several nurses I worked with came to see me throughout the day. Each shared with me a story of their own loss of a pet and the catastrophic grief that followed. We all cried together throughout the day, off and on.
For almost a month after her death, I took a mild tranquilizer each night to help me sleep, for if I didn't, I became consumed with grief, sometimes almost hysterical. I could not even look at a picture of her for over two years without bursting into tears.
This past September was the first year in the past six that I did not cry on her anniversary of passing. I was, I guess, too consumed with Marmalade (the cat I lost October 1st).
I would advise you to ask your physician for something to help you sleep and perhaps something to help you deal with your depression at losing your dog.
I promise you that if your dog could talk to you right now, he/she would thank you for all that you have given and ask you to go on with your life as best as you can.
As for your co-workers, if they understand, that's awesome, if not, the heck with them. I am a clinical social worker and we are now just beginning to understand how devastating the loss of a pet is.
One of my co-workers mentioned to me that losing a dog was like losing a child. "The heck it is", I responded. "Panda never back talked and never asked to borrow money or the car".
Hang in there. It will get better. It really will.
Marm's Mom (and Panda's)