I have a dog who at 8 months old ate god knows how many throw packs of rat bait.
I found Bella one morning and she couldn't stand, was crying etc and her breath was ice cold. Gums had no colour and I had no idea what was wrong with her so did a rush job into the vets who told me they thought it was rat bait however I was puzzled because we don't use any (hate the stuff)
Quick phone call to the owners of the property (we were renting at the time) and was told that unbeknown to us while we were out, the owners had come and put rat bait into their storage shed in our yard that weekend. They also told me that they seen Bella running in the shed with one of their Labs playing with one of the packets but thought they had dropped it.
Long story short - She had 3 blood transfusions, vitamin k injections etc and a week in at the vets and somehow managed to pull through! She was on tablets for 2 months after.
Needless to say we moved out soon after and also made them pay for her vet bill!
Owner learnt a lesson too - at my advise they took their lab to the vets to test for clotting and turned out it had ate some also. Their dog was on vitamin K for a month.