I have just remembered my first ever dog named "Hapi" who was killed through poisoning. He was my little buddy when I was in High School. He died without me around. Our helper in our house told me that in a couple minutes before Hapi died, he seems looking for me all around the house then go out at the back of the house and vomited blood then died. Thank you for sharing this kind of information so others could prevent losing their beloved pets.