I'm so sorry you lost your Toby.

Next month, June 6th, will be one year since I sent my Toby to the bridge.
Her situation was much different than you Toby's was. She was older, and had bone cancer. The tumor was on her hip bone and was cutting circulation off to her leg. Sending them to the bridge when they are old and have lived a long happy life is much easier to take. But in cases as your... when they are taken from us suddenly, it makes it hurt so much worse.
As I said, it's been a year since my Toby's passing and when I hear "her song" my eyes well up with tears and I replay every second of that day over.

The other dogs are feeding off of you, they can sense you are depressed and are following your lead because after all, you are their leader.

Please take comfort in knowing that Toby is now running free at the bridge and will be watching over you until you meet again.