How tragic!
Your friend will, without a doubt, be in my thoughts. I don't even want to begin to think of how it must feel.. to have to rush all of those dogs to the vet.

My aunt's st. bernard mix died late last year due to an angry neighbor of theirs that wanted revenge for a minor dispute that went on between them and my aunt. The neighbors poisoned the dog.
Hoping your friend's dogs will be able to pull through. Like mentioned, they all are bigger dogs, right? If they didn't ingest too much, they have a greater chance of pulling out of this alive.