re: How do you know when it is time to put down your dog?

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Side question, how do you deal with the other dogs in the house?

Do you take them to the vet so they know their roommate is gone?

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Our last 2 dogs were shepherd/lab mixes. Great dogs, they were siblings.

When we took the one to the vet who had been since, I thought maybe that we would not be bringing her home, but I wasn't sure. She didn't come home with me. I held her while she breathed her last. My wife and I cried and loved on her for a couple of minutes then left to come home.
My dog's sibling was lost without her, they had never been apart in their lives. I wish I had thought to take him so he could be with her at the end, but I didn't know it was going to be the end.
We got 2 pups thinking that would help him, but he laid down and died in my garage 7 weeks after his sister passed away. I had taken him to the vet numerous times in the weeks between her death and his. Nothing was found to be wrong with him, but he wouldn't eat regularly and was lethargic.
I'm convinced he died of a broken heart.