Originally posted by Karen
I would take the remaining dog with me to a shelter and see how he reacts to other dogs again. He may help you "choose" a new friend, or he may stick like glue to you, giving you an indication that he's not ready yet.

I would ask neighbors if they saw anyone near your yard just before the incident - that does sound peculiar, and though nothing will bring your babies back, it would be good to know whether your current dog would be safe or not.Is your yard gated, where someone could have opened the gate, then shut it again? If so, can you get a lock for it?

Our hearts ache for you, sooooo sad, you have the right to grieve and we understand how big a part of your life the dogs were.
What she said.
I am so sad for your losses. I once lost two cats in the same week and it was a hard blow. (but they were to old age, not terrible like this)
In most situations I'd say that a new friend to love helps you get past the hurt and on to the feelings of wonderful memories, BUT I am worried that there may be foul play and you should keep that in mind.
Again, I could not be more sorry.